I just upgraded my ASUS router to the 3.0.0.4.386.41700 firmware and it totally broke my 2.4 ghz network. Stuff was randomly dropping and most important my Sonos ARC would no longer connect. Had to revert to the previous version. FYI
After upgrading it turns the wifi on and off a few times I believe this is normal as it works out the Aimesh nodes, I request you try again a reset to defaults wouldn’t also go with out a miss also