Camera no longer connecting to wifi

I purchased 2 "Spotlight Cam Battery" cameras on 9/19/2017 and have never had a problem until recently. I checked the Ring app and noticed that one of my cameras was no longer connected to wi-fi and so I got out the ladder and tried to perform the "reconnect wifi" setup procedure. Pressing the top button did nothing. Pressing the top button for 20 seconds, waiting a minute, and then pressing the top button also did nothing. I think the camera is just plain broken now. I checked and it looks like there is a 1 year warranty so that's not going to help me. I am resigned to purchasing a new battery camera to replace this one. My question is: when I purchase a replacement camera, how do I remove the broken one from my "basic" plan and then add this one instead? Also, is there some other troubleshooting option I might try? Full disclosure, I bought an extra battery pack so both of my cameras have two batteries inside them so I only have to take them out for charging half as often. Also, the batteries in the broken camera are both at 100% state of charge as I had charged them a few weeks before this camera broke. The app still shows the batteries in the broken camera to be around 100% each (all green). Thanks for any help you might offer!