@Kevin_Z Hi, it seems that the symptoms are different; instead, it is more like a unstable connection of 5GHz. When 5ghz goes off, what about the 5GHz wifi led? Try to login to the web UI to check...

I have a similar issue with my Archer C59. The 5.0GHz band connection goes down for a few minutes, possibly rebooting. I lose access to the internet on anything connected to it, but the 2.4GHz...