I got this router 20 days ago, it performed fabulously.  For last couple days my network has been performing horribly.    I disabled the ax channel in 2ghz and 5ghz.  The lan connections where still performing bad aswell.  Diagnosed the connection from wall to router was fine.  Reset router to factory defaults, router still was not performing well.   So unplugged let it cool down as was unusually hot, left it unplugged for 15 minutes put it on top of lego bricks and now works.  Currently thinking about returning as dont want a fire hazard.