Many Live View Mostly Black

I recently installed 2 Pro 2 doorbells. When I look in History, either in the Ring app on my iPhone or at Ring.com on my desktop, there are many "Live View" events. Mostly, when clicking on these, the screen remains black. On the iPhone, there's a little "loading" symbol, but nothing ever loads. However, if I choose to download these events, I can see a video -- and there is nothing apparent that should have triggered anything. So ... what is causing all of these Live View events and why are most of them black?