@baelter 
Solution: Unfortunately; buy another brand router. MR-routers turned out to be unreliable. Tip; Where are you located? Have you experienced change in signal behavior with your carrier before the problems started?
 

  @Ericcc That could definatly be the culprint as the router is installed in a RV.

Hello  @Sunshine 

Supporting @Ericcc issue, regarding the router auto reset for Archer MR600 Hardware V1 with Firmware Version 1.3.0.
I also experienced the same thing, it automatically resets the entire configuration I am not sure if the intermittent power interruptions cause it.
I am from the Philippines and using Globe Telecom with 4G+ connection.

This drove me crazy, as it reset to the default settings of the router like its first run from the box.
If this router only supports OpenWRT, I won't use this faulty OEM stock firmware.

Hopefully, this solve the issue.

Thanks,