AX3000 stops broadcasting Wifi RAX35???

This is a RAX35 but only the RAX40 is listed in the Model listing.

I purchased a Nighthawk AX3000 about 4 months ago.  6 weeks ago it stopped broadcasting Wifi but the Ethernet ports to the internet worked fine.  No computer could see the signal for 2.4 or 5 and my software to scan for signals could not see it.  Wifi still turned on in setttings.  Plugged in one Netgear and no issues.  Called customer support and they confirmed I was on the lastest update and had me do factory reset.  It worked for about 3 more weeks and then started dropping the wifi broadcast again, Ethernet still working and wifi scan cound not find signal.  Got a new modem from the cable company as they said that was next.  Tried a reset and not a solution.  Unplugged for a day and then used again and lasted for about 24 hours and stopped again.  Called support on my last of my 90 days and they said (asfter taking to someone else) to stop AX, start friendly sharing and change MTUs to 1450 of which I said non of these would seem to affect Wifi broadcast just stopping with the ports still working.  It seemed the it is a bad connection to the Wifi radio and then when it heats up after use looses contact.  They said call be it still and issue.  I have been on lastest update throughout.

It worked only 20 hours this time and called back within 24 hours.  I was told I would have to buy a $86 "pro(??) technical support if they were to do anymore trouble shooting.  I ask how I could request the hardware warranty as this looked like a hardware issue and they kept saying that they would only discuss after I paid them.  Asked to to a supervisor and was told no and I could file a complaint!!!  I emailed 2 times to "file a complaint" and no answer.

Is there some fix to the Wifi stopping broadcasting and everything else working great??

Is there anyplace to excercise the one year warranty without paying money for more questionable/bad technical advise.