SXTsq 5 ac (7.20.4) wont reconnect to WiFi network

I’m using SXTsq 5 ac with wifi-qcom-ac package (to be honest two of them). They are connecting as clients to L11UG-5HaxD that use wifi-qcom.

They have very similar configuration - connect to wifi, the wifi is bridged with eth1, eth1 is connected to small switch and there is 1 AP and 1 eth client connected to that switch. Nothing fancy.

Both clients from from network because of the interference, weather etc. For some unknown reason one of the client after some time stops reconnecting to wifi network. I can connect to it from eth side. To be honest I was in a hurry to check any log related things because I connected to it, had issues with winbox on my machine and just power-restart client, which resolved issue.

power-rebooting client is not and option in that location.

Is this well known issue? is there any setting I could tweak in wifi package? Is my only option to hardcode script that will reboot client daily ?

Edit: the fun part is that the client that is closer to WiFi has the issue and not the one away from it.

Edit2: there was nothing like this before. It started week ago and its been just a week and it happend again.