Ether1 disconnects when Wlan connects

RouterOS Beginner Basics
1

Good day

I hope someone can shed some light on my problem.

I have a Groove 52hpn (mipsbe) that I want to use as a CPE router. It has been upgraded to v6.47.3
I have winbox installed and have tried various QuickSet configurations as well as manual attempts at getting this working but to no avail.

The problem is that as soon as the WLan connects the LAN disconnects. Once connected to WLan I can even access the groove from the WLan side on the IP it gets from the Bridge AP but it is as if the Ethernet port gets shut down. When the WLan connects even Winbox via the MAC Address on the Ether1 interface drops a few seconds later.
If the bridge AP is turned off, connectivity to the Mikrotik Ether port re-establishes and all local connectivity to the Mikrotik resumes like DHCP but I fail to get it to pass data through it.

It should not be this difficult.

Required setup is as follows
(Existing 802.11 b/g AP : Bridge) --------> (MikroTik Groove) -----> (New Remote Network)

I have done the below setup via “Quick Set / CPE”.
Wireless:
Band: 2GHz-B/G
Channel Width: 20MHz
Country: south africa
Configuration: Mode = Router
Wireless Network: Address Acqusition = Automatic
Local Network
IP Address = 172.20.30.1/24
DHCP server: on
DHCP Range : 172.20.30.20-172.20.30.100
NAT : on


See config export below:
[admin@MikroTik] > /export

sep/07/2020 12:55:01 by RouterOS 6.47.3

software id = XK5Y-TT5M

model = Groove 52HPn

serial number = 64A405B167F7

/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g country=“south africa” disabled=no frequency=2412 mode=station-pseudobridge ssid=Bridge wireless-protocol=nv2-nstreme-802.11
/interface list
add name=WAN
add name=LAN
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa-psk,wpa2-psk group-ciphers=tkip,aes-ccm mode=dynamic-keys supplicant-identity=MikroTik unicast-ciphers=tkip,aes-ccm
wpa-pre-shared-key=xxxxxx wpa2-pre-shared-key=xxxxxx
/ip pool
add name=dhcp ranges=172.20.30.20-172.20.30.100
/ip dhcp-server
add address-pool=dhcp disabled=no interface=ether1 name=dhcp1
/interface list member
add interface=wlan1 list=WAN
add list=LAN
/ip address
add address=172.20.30.1/24 interface=ether1 network=172.20.30.0
/ip dhcp-client
add disabled=no interface=wlan1
/ip dhcp-server network
add address=172.20.30.0/24 gateway=172.20.30.1 netmask=24
/ip dns
set servers=8.8.8.8
/ip firewall nat
add action=masquerade chain=srcnat out-interface-list=WAN
/system clock
set time-zone-name=Africa/Johannesburg

2

/interface list member
add interface=wlan1 list=WAN
add list=LAN

Not sure of your setup but this seems incomplete.
perhaps
add interface=eth1 list=lan

3

Need more info on your network setup.
From where do you connect? Directly attached to ether1? Connect to IP address 172.20.30.1 or to the MAC address of ether1?
What is the IP address the wlan1 dhcp-client is getting? Same subnet would be a problem.
MAC address access/connect should not be disturbed by DHCP-client or other IP changes.
This export seems incomplete. The WAN and LAN interface list are used in the default firewall rules. They also are used to allow the MAC level access on the LAN-list interfaces. Those lines are missing.
Why “station-pseudobridge” ? You do not want the pseudobridge MAC replacement, but the normal NAT masquerade. Use “station” or “station-bridge”, as WLAN1 terminates the ISP internet subnet, and is just one client for the ISP. “pseudobridge” will not do a NAT masquerade, but a MAC replacement in the WLAN communication for the devices on the LAN side.
" Once connected to WLan I can even access the groove from the WLan side on the IP it gets from the Bridge AP" . Where is that bridge AP??? It might have been there (what explains the missing interface in the LAN interface list line, and the “station-pseudobridge” mode). But this is NOT a repeater setup, or should not be.