RBR20 dropping internet

Yesterday, my wifi started dropping.  I have had the RBR20 configured as an Access Point behind my Verizon Fios router, on which I turned off the wifi.  It had been working seamlessly.  I had set up a Homebridge on a windows laptop, which was also working perfectly fine.  Yesterday morning, I noticed when I was surfing on my phone, that the wifi signal had started to get spotty, similar to before I had gotten the RBR, and I got "No Response" messages on my HomeKit devices connected through HomeBridge.  My wife and sons were complaining when I got home from work that the wifi had dropped several times througout the day.  As far as I know, the only thing that has changed is i upgraded my iPhone and AppleTV to the latest iOS versions.  I attempted to use the Fios diagnostics, and unplugged both the router and Orbi Base units.  I have an iMac right next to the router and base units, but connected via wifi, which showed at various times good wifi but no internet, or no wifi.  My HomeBridge windows PC was showing good wifi but no internet.  I am tearing my hair out trying to chase this down, due to the erratic errors.  I know if I call Verizon, they will blame it on the wifi, but I suspect it may be their problem?  HELP!