wifi keeps disconnecting

RouterOS Beginner Basics
1

Hi,
I just configured my mikrotik from quick set 3 days ago. I set the wireless as in the picture in url below. Today I noticed that wireless connections from the smartphones keeps disconnected, In the log I see below text:
https://imgur.com/0JYUDeW

09:27:50 dhcp,info defconf deassigned 192.168.88.234 from 2E:37:F1:9E:61:92 
09:27:52 dhcp,warning defconf offering lease 192.168.88.234 for 2E:37:F1:9E:61:92 without success 
09:27:56 dhcp,warning defconf offering lease 192.168.88.234 for 2E:37:F1:9E:61:92 without success 
09:28:00 dhcp,info defconf assigned 192.168.88.234 to 2E:37:F1:9E:61:92 
09:28:00 wireless,info AC:50:DE:D7:90:64@wlan1: connected, signal strength -79 
09:28:02 wireless,info AC:50:DE:D7:90:64@wlan1: disconnected, received disassoc: sending station leaving (8), signal strength -79 
09:28:35 wireless,info AC:50:DE:D7:90:64@wlan1: connected, signal strength -70 
09:28:42 wireless,info AC:50:DE:D7:90:64@wlan1: disconnected, received disassoc: sending station leaving (8), signal strength -70 
09:28:48 wireless,info AC:50:DE:D7:90:64@wlan1: connected, signal strength -72 
09:37:34 wireless,info 2E:37:F1:9E:61:92@wlan1: disconnected, group key exchange timeout, signal strength -87 
09:37:34 wireless,info AC:50:DE:D7:90:64@wlan1: disconnected, group key exchange timeout, signal strength -71 
09:37:50 wireless,info AC:50:DE:D7:90:64@wlan1: connected, signal strength -67 
09:40:20 wireless,info 2E:37:F1:9E:61:92@wlan1: connected, signal strength -62 
09:42:34 wireless,info 2E:37:F1:9E:61:92@wlan1: disconnected, group key exchange timeout, signal strength -70 
09:42:38 wireless,info 2E:37:F1:9E:61:92@wlan1: connected, signal strength -67 
09:52:34 wireless,info AC:50:DE:D7:90:64@wlan1: disconnected, group key exchange timeout, signal strength -67 
09:52:34 wireless,info 2E:37:F1:9E:61:92@wlan1: disconnected, group key exchange timeout, signal strength -95 
09:54:35 wireless,info AC:50:DE:D7:90:64@wlan1: connected, signal strength -77
2

If a station does not get an IP address (from DHCP: without success), there will be no Internet traffic possible, and … the station will then often disconnect from the AP (Linux reason code 8 : https://aboutcher.co.uk/2012/07/linux-wifi-deauthenticated-reason-codes/ )

-87 is low signal level, -95 is too low.

3

Yes but also on signal 67 I am getting group key exchange timeout

4

Double check the security profile used, and the security setting in the smartphone.
Read LOG (topic= dhcp, debug) of DHCP server. Something might have been wrong there. (e.g. device might have had the same static IP address?)

5

Hi
Security profile is the default one. If i increase Group key update in security profile to 8 hrs I see less group key exchange timeout. But I continuously see unicast key exchange timeout. No dhcp issues till now

6

Just suggestions for root cause analysis.

Unicast key timeout … could be something with the “Ciphers” in client devices. We prefer Cipher “aes ccm” for performance, but some devices require “tkip”
Or transmission errors? What is the value of TX CCQ in the registration table ?

Default security (?) , is mode “none” AFAIK. And mode “none” has no unicast or multicast keys enabled in Winbox menu..