Extensive data loss on both 2.4 and 5Ghz HAP AC Lite

Hi,
whatever I do to my single HAP AC Lite, unable to achieve stable Wifi for various home devices- 3 different Android phones, 2 different Windows desktops which time by time loosing Wifi connection. I have in other locations HAP AC, AX3- no issues.
Apartments, few neighbors with APs around.
Changing freq, width, default factory config, tuned config in advanced section- nothing helps. Time by time “extensive data loss” and disconnect.
Previously it was used as just AP in other location without any issues for 4 years. 100Mbps Internet FTTX

Distance to end devices up to 8 meters max; 2 rooms small apartment, router on a shelf near to ceiling, power socket with PS 0.5-1m away. No cables, other radio devices around. Previously in the same place was used HaP AC for many years without problems. Almost the same config.

My observations:
More often when PC start video calls on Teams, Google. Sometimes leads to drops of Wifi for other devices too.
No issues during the night when not used


# may/16/2024 20:53:09 by RouterOS 6.49.15
# software id = P0PD-5G79
#
# model = RB952Ui-5ac2nD
# serial number = CC3E0CCxxxxx
/interface ethernet
set [ find default-name=ether1 ] name=ether1-WAN-Telia
/interface bridge
add admin-mac=48:8F:5A:62:08:9A auto-mac=no comment=defconf name=bridge protocol-mode=none
/interface list
add comment=defconf name=WAN
add comment=defconf name=LAN
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
add authentication-types=wpa2-psk disable-pmkid=yes group-key-update=6h mode=dynamic-keys name=linkm5-sec-profile supplicant-identity=\
    MikroTik wpa2-pre-shared-key=xxxxx
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-g/n country="lithuania" disable-running-check=yes disabled=no disconnect-timeout=3s \
    distance=indoors frequency=2417 \
    installation=indoor mode=ap-bridge name=wlan2 security-profile=linkm5-sec-profile ssid=xxxx wireless-protocol=802.11 \
    wmm-support=enabled wps-mode=disabled
set [ find default-name=wlan2 ] band=5ghz-n/ac country="lithuania" disabled=no disconnect-timeout=3s mode=ap-bridge name=wlan5 security-profile=linkm5-sec-profile \
    ssid=xxxxxx wireless-protocol=802.11 wmm-support=enabled wps-mode=disabled
/ip pool
add name=dhcp-pool ranges=192.168.88.10-192.168.88.49
/ip dhcp-server
add address-pool=dhcp-pool disabled=no interface=bridge lease-time=1d name="dhcp defconf"
/interface bridge port
add bridge=bridge comment=defconf interface=ether2
add bridge=bridge comment=defconf interface=ether3
add bridge=bridge comment=defconf interface=ether4
add bridge=bridge comment=defconf interface=ether5
add bridge=bridge comment=defconf interface=wlan2
add bridge=bridge comment=defconf interface=wlan5
/ip neighbor discovery-settings
set discover-interface-list=LAN
/interface list member
add comment=defconf interface=bridge list=LAN
add comment=defconf interface=ether1-WAN-Telia list=WAN
/ip address
add address=192.168.88.1/24 comment=defconf interface=bridge network=192.168.88.0
/ip cloud
set ddns-enabled=yes
/ip dhcp-client
add comment=defconf dhcp-options=clientid,clientid disabled=no interface=ether1-WAN-Telia use-peer-ntp=no
/ip dhcp-server network
add address=192.168.88.0/24 comment="my conf" dns-server=192.168.88.1,9.9.9.9,1.1.1.1 gateway=192.168.88.1 netmask=24 ntp-server=\
    216.239.35.0
/ip dns
set allow-remote-requests=yes
/ip dns static
add address=192.168.88.1 comment=defconf name=router.lan
/ip firewall address-list
add address=xxxx list=RemoteMgmSources
add address=xxxxx list=RemoteMgmSources
/ip firewall filter
add action=drop chain=input comment="defconf: drop invalid" connection-state=invalid
add action=accept chain=input comment="defconf: accept established,related,untracked" connection-state=established,related,untracked
add action=accept chain=input comment="Remote management" dst-port=38291 in-interface=ether1-WAN-Telia protocol=tcp \
    src-address-list=RemoteMgmSources
add action=accept chain=input comment="Remote management" in-interface=ether1-WAN-Telia log=yes protocol=icmp src-address-list=\
    RemoteMgmSources
add action=accept chain=input comment="defconf: accept ICMP" in-interface=bridge protocol=icmp
add action=accept chain=input comment="defconf: accept to local loopback (for CAPsMAN)" disabled=yes dst-address=127.0.0.1
add action=drop chain=input comment="defconf: drop all not coming from LAN" in-interface-list=!LAN
add action=accept chain=forward comment="defconf: accept in ipsec policy" disabled=yes ipsec-policy=in,ipsec
add action=accept chain=forward comment="defconf: accept out ipsec policy" disabled=yes ipsec-policy=out,ipsec
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" connection-state=established,related
add action=accept chain=forward comment="defconf: accept established,related, untracked" connection-state=established,related,untracked
add action=drop chain=forward comment="defconf: drop invalid" connection-state=invalid
add action=drop chain=forward comment="defconf: drop all from WAN not DSTNATed" connection-nat-state=!dstnat connection-state=new \
    in-interface-list=WAN
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" ipsec-policy=out,none out-interface-list=WAN
/ip service
/ip service
set telnet disabled=yes
set ftp disabled=yes
set ssh disabled=yes
set api disabled=yes
set winbox address=192.168.0.16/32,78.57.106.249/32,192.168.88.0/24 port=38291
set api-ssl disabled=yes
/ip ssh
set host-key-size=4096 strong-crypto=yes
/ip upnp
set enabled=yes
/ip upnp interfaces
add interface=bridge type=internal
add interface=ether1-WAN-Telia type=external
/system clock
set time-zone-name=Europe/Vilnius
/system identity
set name=Router
/system logging
add topics=wireless,debug
/system routerboard settings
set auto-upgrade=yes
/tool graphing interface
add allow-address=xxxx/32 interface=ether1-WAN-Telia
add allow-address=xxxx/32 interface=wlan2
add allow-address=xxxx/32 interface=wlan5
/tool graphing resource
add allow-address=xxxxx/32
/tool mac-server
set allowed-interface-list=LAN
/tool mac-server mac-winbox
set allowed-interface-list=LAN



01:24:26 wireless,info 22:AE:BD:EA:20:FA@wlan5: disconnected, extensive data loss, signal strength -67 
01:24:26 wireless,debug wlan5: 22:AE:BD:EA:20:FA attempts to associate 
01:24:26 wireless,debug wlan5: 22:AE:BD:EA:20:FA not in local ACL, by default accept 
01:24:26 wireless,info 22:AE:BD:EA:20:FA@wlan5: connected, signal strength -64 
01:31:04 wireless,info 22:AE:BD:EA:20:FA@wlan5: disconnected, extensive data loss, signal strength -64 
01:31:04 wireless,debug wlan5: 22:AE:BD:EA:20:FA attempts to associate 
01:31:04 wireless,debug wlan5: 22:AE:BD:EA:20:FA not in local ACL, by default accept 
01:31:04 wireless,info 22:AE:BD:EA:20:FA@wlan5: connected, signal strength -61 
01:31:21 wireless,debug wlan2: 68:5D:43:7F:A1:F2 attempts to associate 
01:31:21 wireless,debug wlan2: 68:5D:43:7F:A1:F2 not in local ACL, by default accept 
01:31:21 wireless,info 68:5D:43:7F:A1:F2@wlan2: connected, signal strength -66 
01:31:23 wireless,info 68:5D:43:7F:A1:F2@wlan2: disconnected, received deauth: unspecified (1), signal strength -66 
02:08:39 wireless,debug wlan2: F8:B5:4D:5D:DF:40 attempts to associate 
02:08:39 wireless,info F8:B5:4D:5D:DF:40@wlan2: reassociating 
02:08:39 wireless,info F8:B5:4D:5D:DF:40@wlan2: disconnected, ok, signal strength -61 
02:08:39 wireless,debug wlan2: F8:B5:4D:5D:DF:40 not in local ACL, by default accept 
02:08:39 wireless,info F8:B5:4D:5D:DF:40@wlan2: connected, signal strength -61 
04:31:25 wireless,debug wlan2: 68:5D:43:7F:A1:F2 attempts to associate 
04:31:25 wireless,debug wlan2: 68:5D:43:7F:A1:F2 not in local ACL, by default accept 
04:31:25 wireless,info 68:5D:43:7F:A1:F2@wlan2: connected, signal strength -67 
04:31:27 wireless,info 68:5D:43:7F:A1:F2@wlan2: disconnected, received deauth: unspecified (1), signal strength -67 
07:31:28 wireless,debug wlan2: 68:5D:43:7F:A1:F2 attempts to associate 
07:31:28 wireless,debug wlan2: 68:5D:43:7F:A1:F2 not in local ACL, by default accept 
07:31:28 wireless,info 68:5D:43:7F:A1:F2@wlan2: connected, signal strength -66 
07:31:30 wireless,info 68:5D:43:7F:A1:F2@wlan2: disconnected, received deauth: unspecified (1), signal strength -66 
08:09:35 wireless,info 56:32:66:AB:D6:32@wlan2: disconnected, extensive data loss, signal strength -78 
08:44:50 wireless,debug wlan5: 66:AD:74:67:03:D0 attempts to associate 
08:44:50 wireless,debug wlan5: 66:AD:74:67:03:D0 not in local ACL, by default accept 
08:44:50 wireless,info 66:AD:74:67:03:D0@wlan5: connected, signal strength -54 
08:44:50 dhcp,info dhcp defconf assigned 192.168.88.43 to 66:AD:74:67:03:D0 
08:53:59 wireless,info 66:AD:74:67:03:D0@wlan5: disconnected, received deauth: sending station leaving (3), signal strength -54 
08:53:59 wireless,debug wlan2: 56:32:66:AB:D6:32 attempts to associate 
08:53:59 wireless,debug wlan2: 56:32:66:AB:D6:32 not in local ACL, by default accept 
08:53:59 wireless,info 56:32:66:AB:D6:32@wlan2: connected, signal strength -63 
09:07:30 wireless,debug wlan2: D4:E9:8A:5F:F4:56 attempts to associate 
09:07:30 wireless,debug wlan2: D4:E9:8A:5F:F4:56 not in local ACL, by default accept 
09:07:30 wireless,info D4:E9:8A:5F:F4:56@wlan2: connected, signal strength -69 
09:45:05 wireless,debug wlan2: F8:B5:4D:5D:DF:40 attempts to associate 
09:45:05 wireless,info F8:B5:4D:5D:DF:40@wlan2: reassociating 
09:45:05 wireless,info F8:B5:4D:5D:DF:40@wlan2: disconnected, ok, signal strength -63 
09:45:05 wireless,debug wlan2: F8:B5:4D:5D:DF:40 not in local ACL, by default accept 
09:45:05 wireless,info F8:B5:4D:5D:DF:40@wlan2: connected, signal strength -67 
10:00:32 interface,info ether3 link up (speed 100M, full duplex) 
10:10:03 wireless,info F8:B5:4D:5D:DF:40@wlan2: disconnected, received deauth: unspecified (1), signal strength -63 
10:31:32 wireless,debug wlan2: 68:5D:43:7F:A1:F2 attempts to associate 
10:31:32 wireless,debug wlan2: 68:5D:43:7F:A1:F2 not in local ACL, by default accept 
10:31:32 wireless,info 68:5D:43:7F:A1:F2@wlan2: connected, signal strength -69 
10:31:34 wireless,info 68:5D:43:7F:A1:F2@wlan2: disconnected, received deauth: unspecified (1), signal strength -69 
11:33:48 wireless,info F0:C8:14:05:44:EC@wlan2: disconnected, extensive data loss, signal strength -64 
12:07:38 wireless,debug wlan2: A4:D7:3C:22:F1:BA attempts to associate 
12:07:38 wireless,debug wlan2: A4:D7:3C:22:F1:BA not in local ACL, by default accept 
12:07:38 wireless,info A4:D7:3C:22:F1:BA@wlan2: connected, signal strength -70 
12:07:40 dhcp,info dhcp defconf assigned 192.168.88.39 to A4:D7:3C:22:F1:BA 
12:07:52 wireless,debug wlan2: A4:D7:3C:22:F1:BA attempts to associate 
12:07:52 wireless,info A4:D7:3C:22:F1:BA@wlan2: reassociating 
12:07:52 wireless,info A4:D7:3C:22:F1:BA@wlan2: disconnected, ok, signal strength -70 
12:07:52 wireless,debug wlan2: A4:D7:3C:22:F1:BA not in local ACL, by default accept 
12:07:52 wireless,info A4:D7:3C:22:F1:BA@wlan2: connected, signal strength -66 
12:11:31 wireless,info A4:D7:3C:22:F1:BA@wlan2: disconnected, received deauth: sending station leaving (3), signal strength -66 
12:33:33 wireless,info 22:AE:BD:EA:20:FA@wlan5: disconnected, extensive data loss, signal strength -62 
13:08:29 wireless,info D4:E9:8A:5F:F4:56@wlan2: disconnected, received deauth: unspecified (1), signal strength -69 
13:09:15 wireless,debug wlan2: D4:E9:8A:5F:F4:56 attempts to associate 
13:09:15 wireless,debug wlan2: D4:E9:8A:5F:F4:56 not in local ACL, by default accept 
13:09:15 wireless,info D4:E9:8A:5F:F4:56@wlan2: connected, signal strength -66 
13:21:42 wireless,info 38:F9:D3:58:D6:43@wlan5: disconnected, received disassoc: sending station leaving (8), signal strength -69 
13:31:36 wireless,debug wlan2: 68:5D:43:7F:A1:F2 attempts to associate 
13:31:36 wireless,debug wlan2: 68:5D:43:7F:A1:F2 not in local ACL, by default accept 
13:31:36 wireless,info 68:5D:43:7F:A1:F2@wlan2: connected, signal strength -70 
13:31:38 wireless,info 68:5D:43:7F:A1:F2@wlan2: disconnected, received deauth: unspecified (1), signal strength -70 
14:32:25 wireless,info 16:7B:15:74:67:E6@wlan2: disconnected, extensive data loss, signal strength -75 
15:29:56 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
15:29:56 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
15:29:56 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -76 
15:29:58 dhcp,info dhcp defconf assigned 192.168.88.34 to AA:F3:7B:9A:93:CB 
15:30:00 dhcp,info dhcp defconf deassigned 192.168.88.34 from AA:F3:7B:9A:93:CB 
15:30:01 dhcp,info dhcp defconf assigned 192.168.88.34 to AA:F3:7B:9A:93:CB 
16:21:32 wireless,info 56:32:66:AB:D6:32@wlan2: disconnected, received deauth: sending station leaving (3), signal strength -62 
16:31:40 wireless,debug wlan2: 68:5D:43:7F:A1:F2 attempts to associate 
16:31:40 wireless,debug wlan2: 68:5D:43:7F:A1:F2 not in local ACL, by default accept 
16:31:40 wireless,info 68:5D:43:7F:A1:F2@wlan2: connected, signal strength -67 
16:31:43 wireless,info 68:5D:43:7F:A1:F2@wlan2: disconnected, received deauth: unspecified (1), signal strength -67 
17:24:14 wireless,info AA:F3:7B:9A:93:CB@wlan5: disconnected, extensive data loss, signal strength -76 
17:24:14 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
17:24:14 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
17:24:14 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -62 
17:27:20 wireless,info AA:F3:7B:9A:93:CB@wlan5: disconnected, extensive data loss, signal strength -62 
17:27:21 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
17:27:21 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
17:27:21 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -62 
17:51:03 wireless,info AA:F3:7B:9A:93:CB@wlan5: disconnected, extensive data loss, signal strength -62 
17:51:03 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
17:51:03 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
17:51:03 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -81 
18:04:09 wireless,debug wlan5: 22:AE:BD:EA:20:FA attempts to associate 
18:04:09 wireless,debug wlan5: 22:AE:BD:EA:20:FA not in local ACL, by default accept 
18:04:09 wireless,info 22:AE:BD:EA:20:FA@wlan5: connected, signal strength -52 
18:26:53 wireless,debug wlan5: 66:AD:74:67:03:D0 attempts to associate 
18:26:53 wireless,debug wlan5: 66:AD:74:67:03:D0 not in local ACL, by default accept 
18:26:53 wireless,info 66:AD:74:67:03:D0@wlan5: connected, signal strength -70 
18:30:30 wireless,info AA:F3:7B:9A:93:CB@wlan5: disconnected, received disassoc: sending station leaving (8), signal strength -81 
18:30:34 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
18:30:34 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
18:30:34 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -55 
18:35:47 wireless,debug wlan2: 56:32:66:AB:D6:32 attempts to associate 
18:35:47 wireless,debug wlan2: 56:32:66:AB:D6:32 not in local ACL, by default accept 
18:35:47 wireless,info 56:32:66:AB:D6:32@wlan2: connected, signal strength -82 
18:35:47 wireless,info 66:AD:74:67:03:D0@wlan5: disconnected, extensive data loss, signal strength -70 
18:36:11 wireless,info 56:32:66:AB:D6:32@wlan2: disconnected, received deauth: sending station leaving (3), signal strength -82 
19:31:44 wireless,debug wlan2: 68:5D:43:7F:A1:F2 attempts to associate 
19:31:44 wireless,debug wlan2: 68:5D:43:7F:A1:F2 not in local ACL, by default accept 
19:31:44 wireless,info 68:5D:43:7F:A1:F2@wlan2: connected, signal strength -68 
19:31:49 wireless,info 68:5D:43:7F:A1:F2@wlan2: disconnected, received deauth: unspecified (1), signal strength -68 
19:34:47 wireless,debug wlan5: 38:F9:D3:58:D6:43 attempts to associate 
19:34:47 wireless,debug wlan5: 38:F9:D3:58:D6:43 not in local ACL, by default accept 
19:34:47 wireless,info 38:F9:D3:58:D6:43@wlan5: connected, signal strength -74 

20:53:24 wireless,info 22:AE:BD:EA:20:FA@wlan5: disconnected, extensive data loss, signal strength -58 
20:53:24 wireless,debug wlan5: 22:AE:BD:EA:20:FA attempts to associate 
20:53:24 wireless,debug wlan5: 22:AE:BD:EA:20:FA not in local ACL, by default accept 
20:53:24 wireless,info 22:AE:BD:EA:20:FA@wlan5: connected, signal strength -60 

20:56:19 wireless,info D2:CF:4A:AC:ED:E1@wlan2: disconnected, disabling, signal strength -57 
20:56:19 wireless,info D4:E9:8A:5F:F4:56@wlan2: disconnected, disabling, signal strength -70 

20:56:30 wireless,debug wlan2: D4:E9:8A:5F:F4:56 attempts to associate 
20:56:30 wireless,debug wlan2: D4:E9:8A:5F:F4:56 not in local ACL, by default accept 
20:56:30 wireless,info D4:E9:8A:5F:F4:56@wlan2: connected, signal strength -67 
20:56:31 wireless,info 22:AE:BD:EA:20:FA@wlan5: disconnected, disabling, signal strength -64 
20:56:31 wireless,info 38:F9:D3:58:D6:43@wlan5: disconnected, disabling, signal strength -66 
20:56:31 wireless,info AA:F3:7B:9A:93:CB@wlan5: disconnected, disabling, signal strength -78 

20:56:31 wireless,debug wlan5: 22:AE:BD:EA:20:FA attempts to associate 
20:56:31 wireless,debug wlan5: 22:AE:BD:EA:20:FA not in local ACL, by default accept 
20:56:31 wireless,info 22:AE:BD:EA:20:FA@wlan5: connected, signal strength -64 
20:56:33 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
20:56:33 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
20:56:33 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -74 
20:56:35 wireless,debug wlan2: D2:CF:4A:AC:ED:E1 attempts to associate 
20:56:35 wireless,debug wlan2: D2:CF:4A:AC:ED:E1 not in local ACL, by default accept 
20:56:35 wireless,info D2:CF:4A:AC:ED:E1@wlan2: connected, signal strength -53 
20:57:13 wireless,info 22:AE:BD:EA:20:FA@wlan5: disconnected, disabling, signal strength -65 
20:57:13 wireless,info AA:F3:7B:9A:93:CB@wlan5: disconnected, disabling, signal strength -73 

20:57:14 wireless,debug wlan5: 22:AE:BD:EA:20:FA attempts to associate 
20:57:14 wireless,debug wlan5: 22:AE:BD:EA:20:FA not in local ACL, by default accept 
20:57:14 wireless,info 22:AE:BD:EA:20:FA@wlan5: connected, signal strength -64 
20:57:15 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
20:57:15 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
20:57:15 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -73 
20:59:09 wireless,debug wlan5: 38:F9:D3:58:D6:43 attempts to associate 
20:59:09 wireless,debug wlan5: 38:F9:D3:58:D6:43 not in local ACL, by default accept 
20:59:09 wireless,info 38:F9:D3:58:D6:43@wlan5: connected, signal strength -73 
20:59:54 wireless,info AA:F3:7B:9A:93:CB@wlan5: disconnected, extensive data loss, signal strength -73 
20:59:54 wireless,debug wlan5: AA:F3:7B:9A:93:CB attempts to associate 
20:59:54 wireless,debug wlan5: AA:F3:7B:9A:93:CB not in local ACL, by default accept 
20:59:54 wireless,info AA:F3:7B:9A:93:CB@wlan5: connected, signal strength -79 
21:01:40 wireless,debug wlan5: 66:AD:74:67:03:D0 attempts to associate 
21:01:40 wireless,debug wlan5: 66:AD:74:67:03:D0 not in local ACL, by default accept 
21:01:40 wireless,info 66:AD:74:67:03:D0@wlan5: connected, signal strength -45



[Router] /interface wireless registration-table> pr
 # INTERFACE                                            RADIO-NAME       MAC-ADDRESS       AP  SIGNAL-STRENGTH TX-RATE UPTIME              
 0 wlan2                                                                 D4:E9:8A:5F:F4:56 no  -72dBm@6Mbps    14.4... 18m32s              
 1 wlan2                                                                 D2:CF:4A:AC:ED:E1 no  -55dBm@1Mbps    72.2... 18m26s              
 2 wlan5                                                                 22:AE:BD:EA:20:FA no  -63dBm@6Mbps    72.2... 17m48s              
 3 wlan5                                                                 38:F9:D3:58:D6:43 no  -74dBm@6Mbps    86.6... 15m53s              
 4 wlan5                                                                 AA:F3:7B:9A:93:CB no  -90dBm@6Mbps    21.6... 15m8s               
 5 wlan5                                                                 66:AD:74:67:03:D0 no  -64dBm@6Mbps    78Mb... 13m22s



@Router] /interface wireless registration-table> pr stat
 0 interface=wlan2 mac-address=D4:E9:8A:5F:F4:56 ap=no wds=no bridge=no rx-rate="6Mbps" tx-rate="39Mbps-20MHz/2S" packets=280,222 
   bytes=14680,12623 frames=87,224 frame-bytes=17185,11529 hw-frames=795,414 hw-frame-bytes=159085,25017 tx-frames-timed-out=0 
   uptime=20m17s last-activity=750ms signal-strength=-68dBm@6Mbps signal-to-noise=48dB signal-strength-ch0=-71dBm 
   signal-strength-ch1=-70dBm 
   strength-at-rates=-70dBm@5.5Mbps 20m17s330ms,-68dBm@6Mbps 750ms,-65dBm@HT20-0 20m15s840ms,-68dBm@HT20-1 20m17s180ms tx-ccq=83% 
   p-throughput=36145 last-ip=192.168.88.40 802.1x-port-enabled=yes authentication-type=wpa2-psk encryption=aes-ccm 
   group-encryption=aes-ccm management-protection=no wmm-enabled=yes tx-rate-set="OFDM:6-54 BW:1x SGI:1x HT:0-15" 

 1 interface=wlan2 mac-address=D2:CF:4A:AC:ED:E1 ap=no wds=no bridge=no rx-rate="65Mbps-20MHz/1S" tx-rate="72.2Mbps-20MHz/1S/SGI" 
   packets=7287,6271 bytes=4643864,2917050 frames=6018,5891 frame-bytes=4677197,2891027 hw-frames=7339,7653 
   hw-frame-bytes=6347914,3171889 tx-frames-timed-out=0 uptime=20m11s last-activity=3s790ms signal-strength=-55dBm@1Mbps 
   signal-to-noise=61dB signal-strength-ch0=-63dBm signal-strength-ch1=-57dBm 
   strength-at-rates=-55dBm@1Mbps 19s790ms,-56dBm@6Mbps 3s790ms,-58dBm@24Mbps 3s950ms,-59dBm@HT20-0 6m2s790ms,-67dBm@HT20-1 10m2s550ms,-
                  57dBm@HT20-2 6m3s960ms,-58dBm@HT20-3 6m2s960ms,-58dBm@HT20-4 6m2s950ms,-58dBm@HT20-5 6m2s950ms,-54dBm@HT20-6 10m700ms,-
                  59dBm@HT20-7 3s930ms 
   tx-ccq=100% p-throughput=58246 last-ip=192.168.88.36 802.1x-port-enabled=yes authentication-type=wpa2-psk encryption=aes-ccm 
   group-encryption=aes-ccm management-protection=no wmm-enabled=yes tx-rate-set="OFDM:6-54 BW:1x SGI:1x HT:0-7" 

 2 interface=wlan5 mac-address=22:AE:BD:EA:20:FA ap=no wds=no bridge=no rx-rate="78Mbps-20MHz/1S" tx-rate="54Mbps" packets=55195,27408 
   bytes=58099796,6871542 frames=34069,20444 frame-bytes=58650664,6916133 hw-frames=45063,21822 hw-frame-bytes=76617044,7766933 
   tx-frames-timed-out=0 uptime=19m33s last-activity=2s910ms signal-strength=-62dBm@6Mbps signal-to-noise=46dB signal-strength-ch0=-62dBm 
   strength-at-rates=-62dBm@6Mbps 2s910ms tx-ccq=104% p-throughput=1312 distance=1 last-ip=192.168.88.30 802.1x-port-enabled=yes 
   authentication-type=wpa2-psk encryption=aes-ccm group-encryption=aes-ccm management-protection=no wmm-enabled=yes 
   tx-rate-set="OFDM:6-54 BW:1x SGI:1x HT:0-7 VHTMCS:SS1=0-9" 

 3 interface=wlan5 mac-address=38:F9:D3:58:D6:43 ap=no wds=no bridge=no rx-rate="86.6Mbps-20MHz/1S/SGI" tx-rate="86.6Mbps-20MHz/1S/SGI" 
   packets=565245,331530 bytes=687859884,98366700 frames=376416,253692 frame-bytes=691846336,99202753 hw-frames=401956,255430 
   hw-frame-bytes=765683475,109420499 tx-frames-timed-out=0 uptime=17m38s last-activity=10ms signal-strength=-65dBm@24Mbps 
   signal-to-noise=43dB signal-strength-ch0=-65dBm strength-at-rates=-69dBm@6Mbps 1m29s810ms,-73dBm@12Mbps 6m1s550ms,-65dBm@24Mbps 200ms 
   tx-ccq=92% p-throughput=77221 distance=4 last-ip=192.168.88.44 802.1x-port-enabled=yes authentication-type=wpa2-psk encryption=aes-ccm 
   group-encryption=aes-ccm management-protection=no wmm-enabled=yes tx-rate-set="OFDM:6-54 BW:1x SGI:1x HT:0-7 VHTMCS:SS1=0-9" 

 4 interface=wlan5 mac-address=AA:F3:7B:9A:93:CB ap=no wds=no bridge=no rx-rate="7.2Mbps-20MHz/1S/SGI" tx-rate="21.6Mbps-20MHz/1S/SGI" 
   packets=580,470 bytes=394167,86381 frames=451,422 frame-bytes=397903,85286 hw-frames=1188,864 hw-frame-bytes=738605,112742 
   tx-frames-timed-out=0 uptime=16m53s last-activity=17s500ms signal-strength=-90dBm@6Mbps signal-to-noise=18dB 
   signal-strength-ch0=-90dBm strength-at-rates=-90dBm@6Mbps 17s500ms tx-ccq=72% p-throughput=508 distance=1 last-ip=192.168.88.34 
   802.1x-port-enabled=yes authentication-type=wpa2-psk encryption=aes-ccm group-encryption=aes-ccm management-protection=no 
   wmm-enabled=yes tx-rate-set="OFDM:6-54 BW:1x SGI:1x HT:0-7 VHTMCS:SS1=0-9" 

 5 interface=wlan5 mac-address=66:AD:74:67:03:D0 ap=no wds=no bridge=no rx-rate="78Mbps-20MHz/1S" tx-rate="78Mbps-20MHz/1S" 
   packets=14987,6001 bytes=17052138,1701977 frames=9155,4760 frame-bytes=17203408,1698731 hw-frames=11683,5341 
   hw-frame-bytes=23404155,1912478 tx-frames-timed-out=0 uptime=15m7s last-activity=5s880ms signal-strength=-63dBm@6Mbps 
   signal-to-noise=45dB signal-strength-ch0=-63dBm strength-at-rates=-63dBm@6Mbps 5s880ms tx-ccq=89% p-throughput=70193 distance=1 
   last-ip=192.168.88.43 802.1x-port-enabled=yes authentication-type=wpa2-psk encryption=aes-ccm group-encryption=aes-ccm 
   management-protection=no wmm-enabled=yes tx-rate-set="OFDM:6-54 BW:1x SGI:1x HT:0-7 VHTMCS:SS1=0-9"

Replaced AC Lite with old HAP AC 962UiGS-5HacT2Hn, almost default configuration.
One week was working perfectly and then again… the same error and disconnection from Wifi started.

Tried on 5 and 2.4 Ghz various bands, widths- nothing helps. CCQ 100-40% depends on client location. CPU util 1-5% . No issues over cable.

How to identify external factors?

dont have more ideas :frowning: gave up

You might want to set bandwidth explicitly. Can you perform a wifi scan?

Perhaps you can set the channel explicitly on the 5GHz radio?
Has the frequency set on the 2.4GHz radio the least interference?

Yes, channels fixed, no auto etc . I was trying to change channels, bands etc but nothing helps. Even replaced router with other model.

one device example:
16:37:26 wireless,info D2:CF:4A:AC:ED:E1@wlan2: disconnected, extensive data loss, signal strength -50
16:42:41 wireless,info D2:CF:4A:AC:ED:E1@wlan2: connected, signal strength -51
16:49:31 wireless,info D2:CF:4A:AC:ED:E1@wlan2: disconnected, extensive data loss, signal strength -51
16:51:37 wireless,info D2:CF:4A:AC:ED:E1@wlan2: connected, signal strength -58
CCQ 65%

08:44:39 wireless,info F8:B5:4D:5D:DF:40@wlan2: disconnected, extensive data loss, signal strength -70
09:10:14 wireless,info F8:B5:4D:5D:DF:40@wlan2: connected, signal strength -60
09:20:43 wireless,info F8:B5:4D:5D:DF:40@wlan2: disconnected, extensive data loss, signal strength -60


the same on both- 2.4 and 5Ghz.