Thanks, I found the issue - looks I didn't upgrade the firmware in time. I had version 1.0.2 After upgrading to 1.0.23 version everything started working correctly. I'm on 1.0.30 now.

I noticed that every 24-48 hours my RE315 partially disconnects. 5Ghz network continues working. But the 2.4Ghz network becomes completely off, and it's indicator doesn't light. Wifi indicator...