Ive seen some of rock and roll circus on you tube. If I was John Id take rolls of duck tape and shut Yoko up. She completely ruins some of the jams by wailing like someone is stomping her toe. Ive seen a lot of other jams with her involved and she always ruins everything with her terrible...
That happens to me all the time, I feel like the screen is always moving ,then ill look at my DVD player or something with the screen still in my side view and things get weird.
If thats the only thing they stole I would bet they knew you had it. I would consider the kid who sold you the camera and any one he told (his friends) as suspects.