Sorry to hear about this concern, you should defintely be receiving video. Black video can have different causes, we can certainly help to narrow down the variables. A great first step would be to uninstall and reinstall the Ring Application. If this does not improve or resolve the black video, feel free to respond with any further details such as device type and RSSI reading.
I’ve moved this post to a board that is closer to the topic discussed here, where other neighbors can easily find it in case they want to share suggestions or have the same question.