Gl.iNet Mango / Mango - GL.iNet mt76x8: Wifi issues with mt76_wmac vanilla openwrt 19.07.4

Installing and Using OpenWrt
1

Wifi issues with mt76_wmac vanilla openwrt 19.07.4

I am exploring wifi issues happening once every few days. When the prolem appears the wifi wan connection to the AP stops and doesn't ever recover. Even when unloading the kernel module for mf76. So far the only revocery is rebooting.

The setup is wlan2wlan with wan: wifi client - lan: wifi AP.

significant loglines look like: mt76_wmac ... timed out...

any ideas for a workaround or even fix?
thanks 1000x
Mischa

config:
SoC Type: MediaTek MT7628AN ver:1 eco:2

config wifi-device 'radio_bgn'
        option type 'mac80211'
        option channel '11'
        option hwmode '11g'
        option path 'platform/10300000.wmac'
        option htmode 'HT20'
        option disabled '0'

config wifi-iface 'nw_ap_bgn'
        option device 'radio_bgn'
        option network 'lan'
        option mode 'ap'
        option isolate '1'
        option ssid 'xxx'
        option encryption 'psk2'
        option key 'xxx'
        option disabled '0'

config wifi-iface 'nw_wifi_client_bgn'
        option device 'radio_bgn'
        option mode 'sta'
        option network 'wwan'
        option encryption 'psk2'
        option ssid 'xxx'
        option key 'xxx'
        option disabled '0'

MIPS: machine is GL-MT300N-V2
[ 12.351439] mt76_wmac 10300000.wmac: ASIC revision: 76280001
[ 13.390246] mt76_wmac 10300000.wmac: Firmware Version: 20151201
[ 13.396271] mt76_wmac 10300000.wmac: Build Time: 20151201183641

DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='19.07.4'
DISTRIB_REVISION='r11208-ce6496d796'
DISTRIB_TARGET='ramips/mt76x8'
DISTRIB_ARCH='mipsel_24kc'

Linux md-home-wifirouter 4.14.195 #0 Sun Sep 6 16:19:39 2020 mips GNU/Linux

2

I have the same issue in AP only mode (19.07.3, 19.07.4 and 19.07.5).

3

I have tested with a snapshot release a week ago and had a crash again today. Same same unfortunately.
I asked gl.inet support for their version of the wifi driver but only got a link to a dead old github repo..