I am facing the same problem with Doorbell 2. Black screen with ring logo on playing motion video. Live view recording and viewing fine. Called ring help 3-4 times, tried all the remidies they suggested. No issue with the router speed, using same router for many years . They though it could be a hardware issue. They sent me a new door bell 2.
After instalation, new doorbell recorded and played 2-3 motions on the day one (no black screen). Later, picture turned black again. I am back to square 1.
I do not want to call them again as Ring people don’t have any remedy for this issue. I believe this is some kind of bug like Corona Virus which needs to be rectified asap. This is a security issue and ring people should take the responsibility if something happened to my property.
After reading other people’s post, black screen issue appears pandemic
FOR GOOD SAKE PLEASE DO SOMETHING