Indoor camera not working

I have re-set the camera and downloaded the Ring app again. I get nothing. Black screen and "loading ... activating device". The camera is plugged into a power source, and the signal is strong. This is very frustrating. This camera is to help us with our son who is disabled, and I don't know if I just need to ditch Ring and find something more reliable. This is a persistent problem. The camera at the door (which I've just noticed is also NOT working) was recently wired to the electrical and was doing just fine. I feel like I bought very expensive toys that just don't do what I need them to do, even if my needs are simple.