Weird Webcam Experience

While recording a new episode of The Daily Drive I had a strange experience with my SJCAM camera SJ5000.  I made a video explaining the situation but I can't figure it out.  Maybe you know?  Two independent cameras do the same thing together without being linked in any way.

Unfortunately there wasn't enough footage for a Daily Drive episode so I'll need to try again.  We'll see if the issue repeats.  I think we all know what caused it though....