Indoor Cams dropping offline

I currently run 7 indoor cams, 1 elite POE, and 1 elite pro doorbell with a chime pro. 2 days ago 2 of my indoor cams dropped offline. I tried to reset them, rescan code, manually re-enter WiFi password, etc and I can no longer get them back online again. I have numerous WiFi devices along with a full network system thought out the home. I purposely unplugged a working indoor cam and after plugging it back in, it would not connect. I am with 15’ line of site to my router. I tried to use my chime pro as a go between to my router as well. After doing this it knocked my chime pro offline and it took nearly 1.5 hours to come back online by itself. However the cameras will not reconnect. I also spent 1-3/4 hours on the phone with level 2 ring techs. Nothing we did worked. I also set up another WiFi network to test if the cams were not working at all. None of the cams that stopped working would come back online even with a totally different network at another location. Seems very strange. The only theory that makes sense is when they powered back up they received a firmware update that bricked them. I tested another brand WiFi cam and it came up on my home network without an issue. Normally I never call tech support unless I have tried every type of idea. They emailed their engineers to see if there might be something else to try. My last idea was to buy another indoor cam and set it up to see if it works. They told me to wait to hear from them before I do this. Any input would be appreciated. Thanks!