I also noticed this issue, but it also happens with non DFS channels. If I select channel 48 the router reverts to channel 36. I am alone on the 5GHz band acording to inSSIDer.

Archer AX50 (EU).

With FW 1.0.5 beta by@Carl, I don't have this issue. It's been two weeks since I downgraded to this fw and the channel did not change.

@-King- 

I've had this problem twice. First time, I got a beta software, it worked, then the beta was upgraded to a new stable version, and it contintued to work.

About a month later, I was having the same problems. I was issues another beta and it seems to be working. All I can do now is be a good user and turn in the router logs if something happens in the future. I hope it keeps working fine.

Hi Everyone.  

We have a current Beta Firmware that is designed to capture logs and help diagnose the concern further.  From what i am told by the team it does not fix the concern.  If anyone here would like to participate and help us locate the cause and resolve please let me know and I will have the engineering team enage with you and provide the beta firmware. 

@Carl 

I'm having this issue with the latest firmware. The channel always resets to 36, no matter what channel i set manually. It goes to the DFS for a brief period of time, but then reverts eventually.