Xiaomi r3g v1 - suddenly stops working

Hi guys,

For an unknown reason, my router is failing from time to time. Every 3-4 days device will stop to operate normally. During that process there is no internet connection (duh), can't reach the router via IP address or SSH. The only way to get it working back again is to power off and on. System and Kernel logs don't show anything and I'm cluless to be honest. I did not have those issues on other custom builds such as Padavan.
Are there any deep logs that may contain some more info about this issue? Or any idea how to troubleshoot it?
I'm currently using latest stable version 19.07.4.

I observed the same on the same hardware on latest trunk