Peephole Cam not connecting to WiFi

I am beyond frustrated. I have had my Peephole Cam for 2 years. Do they basically malfunction after 2 years? It will not reconnect to WiFi (my WiFi is working fine, I even had a technician from the ISP come in to check), and also says there is no battery when there is a fully charged battery in the unit. Firmware is up to date according to the app. I've already bought a new one but I'm still trying to get the old one to work. I don't know why it has to be this hard.