Wifi regularly disconnecting all devices Nighthawk AC1900 (R6900) - dropping both bands every day

I've had the Nighthawk AC1900 (R6900) for about 6 months and after a few months it started disconnecting then reconnecting all devices on both bands.   At first it was just occassionally, now it is at least once daily.  Thermostat, wireless security cameras, printers, tablets, phones (both iPhone and Android), PCs - everything gets disconnected.  However, all lights are green on the router, and the status is fine on the Netgear genie online.  I recently updated the firmware to V1.0.1.34_1.0.24, it still does it.

For each network, I changed the channel settings from Auto to specific channel numbers.   Worked for a day, then back to it.

I reset the router to factory defaults, then manually reconfigured it all over again yesterday.   Today everything got disconnected again.   Such an unreliable piece of equipment.  Of course tech support expired after 90 days, and I don't want to shell out another $50 minimum for tech support now.

I am not using the parental controls, QoS, or Readyshare.   Just the basic 2.4 and 5 Ghz networks.  Works great for a while then everything is disconnected at once.  Now it will not automatically reconnect anything.   I have to reboot the router at least once a day to keep things working.   So frustrating.   About to get a Linksys or DLink router instead.

I have searched and searched through this community and watched the videos trying to get ideas, but none of them work for more than a day.   Does anybody have any more ideas before I donate this router to charity or the trash can?

Is there any way to decipher the log to figure out what in the world is going on with this thing?

This page is insisting on a Model number, but this model is not even included in the drop down list!  I was forced to pick something to even be able to submit this plea for help, so I chose the R7000.   But it is REALLY the R6900/AC1200.

Thanks,

GEinCO