Ring Video Doorbell Pro Offline, Dead, Defective

I was very pleased with my Ring Video Doorbell Pro until… The defective product saga began. The first Video Doorbell Pro worked great for about a year, then the camera got stuck in night vision. I contacted Ring support and after exhausting all troubleshooting options, they gave me a discount on a new Video Doorbell Pro, since the warranty had expired. Video Doorbell Pro #2 worked for about 6-7 months then went completely dead. After what seemed like hours on the phone with support we were able to diagnose that the transformer wasn’t providing enough power. I upgraded the transformer to one with 16vac 30va output. “Compatible with all video doorbells” it said on the box. Since Video Doorbell Pro #2 was still under warranty, Ring sent Video Doorbell Pro #3. After installation, Video Doorbell Pro #3 powered up and entered setup mode, but the Ring app would not join the doorbell’s temporary WiFi network. After another hour-long call with Ring support and exhausting all troubleshooting options, Ring sent refurbished Video Doorbell Pro #4. This refurbished unit powered up, entered setup mode, connected to the temporary WiFi through the app, which then connected to my WiFi network. Video Doorbell Pro #4 worked beautifully ONE TIME (one test ring), then went offline. Now, Video Doorbell Pro #4 powers on but will not enter setup mode. After some web searching I learned that the Video Doorbell Pro has a hidden USB port and an internal battery, which is notorious for failing. Thinking that a dead battery may be the issue, I plugged Video Doorbell Pro #4 into AC power via USB with the same result - a useless product. Needless to say, I am beyond disappointed, and finished with Ring’s defective product.