I'm working on a video project for a someone. A video tape that was given to me to capture has a problem I've never seen before. The picture rolls as if the vertical hold on the TV is out of adjustment. Running it thru my JVC 9800 with picture stabilizer on and TBC on along with a TBC-1000 has minimized it to one or two rolls during the portion I needed to capture. What would cause the video to do that. It's an original tape recorded direct from TV.

Steve