ASUS initially stonewalled me - they asked a litany of questions that were nonsense. And then it was back to "what devices are you connecting" when the core problem is that it will not reconnect after a power outage (and loses ability to operate after a couple of days). Yes, temperature has been fine/perfect - <65 degrees CPU, radios <55 degrees.Have you tested line voltage? High voltage burns out electronic equipment. Are you using a surge protector?
I was pleasantly surprised by the ease of warranty service from Asus. Filled out an online form, sent off the unit, got email updates and new replacement unit in short order.
I've reset and changed firmware 30 times with no success.
Something happened around the time Merlin 386.5 came out. Not sure what it was. (note - I'm running 386.3_2 on my backup RT-AC5300 and it's fine for now - it's behind three layers of firewall so I'm not concerned re: Russia).
I have a pretty good surge on the main (GT-AC5300), and the AX11000 is plugged into an enterprise-grade (or prosumer, sorry), UPS.
All of my RT-AC68U (and 66U_B1, same thing) have been perfect. I have three of those - one active, one warm standby, one cold standby - dating back years.