Ring Camera not connecting to Wifi

I have two ring camera doorbells. One front door and one back door. The front door one works fine, and is connected to wifi. The back door one randomly lost wifi connection, even though it is literally above the router (we have xfinity). I did everything they said to do. Reset router, reset ring doorbell, it is fully charged, restarted phone, updated the app, etc. The back door camera will connect to the wifi when I reset the router, and then lose connection 5 minutes later. It has worked fine for the last 8 months, and randomly cant connect now.  Does anyone have ANY ideas? Something with Xfinity? all the posts I see online are stating that Ring just has a terrible wifi connector in them and that blink is more reliable. Thanks