You need to make a video stopper on the next page. If you turn the page and that page has another video on it, then the previous video will stop because the new page video is starting. While clumsy, you can place a small video that has only one split second and one small white frame, and put it somewhere on the blank part of the next page.
Thanks Michael. There are already proceeding videos in the document and they don't seem to stop the previous one from playing- they all just roll right now. Any other ideas?
Hmmm. I must be mis-remembering that one. I was googling the matter and I can't find what I was remembering, either. Sorry!