Who knows why?
Infrastructure:
The same for RPi 4. On the RPi 4 is the 4.3.0 full version.
At the same time, I saw that the device was reloaded (I saw it on the terminal). I suspected that reboot by OpenWRT (reboot by the web interface) and reboot from the terminal are not equivalent. A week ago, I rebooted the device by the web interface. Now, that functionality stopped working unexpectedly. I don’t know what happened. I still experience instability in the 4.x versions of CS OS.
I changed the wwan ipaddr to 192.168.0.100 and logged into AP. If I lose 192.168.0.1, the getaway is unreachable). 192.168.0.1 is the address of my router.