I've got a 5 camera setup on a multi-cam sequences and things will be going smooth as silk, then for whatever reason, one camera suddenly decides to disappear or, it shows in the multi-cam window but when I click on it it shows black on the program monitor. (see pic) This has happened to me since Premiere 2018. Again, everything goes well and then suddenly one camera disappears. Not always the same camera. When I restart Premiere I get the camera back... then it will eventually happen again. Yep, Ive dumped cash. Any ideas?