I bought an Aircher Air R5 router in 2024.07. It has worked perfectly so far. In the past month it has been stopping randomly. Unpredictably. I use it behind a provider's ONT.

Version A:

It stops in router mode, the LED turns red. There is no wifi or lan. You can't log into the device on the Tether app and it can't be accessed on the web interface either. If I unplug the power supply and plug it back in, it restarts and works properly.

Version B:

I use it as an access point, then the LED turns red for a few seconds, then back to blue, there is wifi, there is lan, there is a network, but it can't be accessed in the Tether app or on the web interface. After a restart, everything is fine.

 What I tried:

MAC address cloning, factory reset, SNTP server reset, auto reboot off and on, ipv4 and ipv6 off and on.

Please help, what could be the problem?

Thank you for your answer.