I'm not saying this is the cause, but I've seen that before on cameras that I added to BI manually. Do you see any issues connecting directly to the camera? I would have intermittent connections, weird frame rate readings, grey screen with pixellation at the bottom. When I added cameras using the inspect button, should pick the correct settings to pull the stream. I have not had an issue since. You may also want to adjust the bitrate and fps, just to see if you notice a difference. Follow best practices when setting up cams in BI. Match fps and i frame, use appropriate bitrate for resolution. Be aware of camera capabilities, just because it may say 30fps doesn't mean you need to run 30fps and max the camera CPU out where the feed starts dropping. And recommend setting to base H.264 in the camera settings.