Ring Pro Offline-

I got a ring doorbell about 6 months ago. It worked great until a couple of weeks ago. It just stopped working for no reason. I've tried it all - turning off the breaker, reset the modem, hard reset the device, pushed the soft button. Hired an electrician to test the voltage - it's getting 18 volts. Installed a new transponder. What else can I try. When I push the reset button sometimes it lights up and blinks once. Doesn't do anything else. Never spins around and around like the directions say. When I try to connect anyway, the app repeatedly says "unable to join". The ring chime worked perfect. The doorbell? Spent hours trying to get this to work, spent more $ to get it to work with an electrician. I'm about to throw it in the trash and get a product that works. HELP