Hi all, I have a modified pioneer 535. When i play DVDs. Sometimes the picture just stops and get stuck.(Won't continue to play) How is this possible? Is it because the DVD is dirty? Or is it a problem with my player. Most DVDs are rentals and after i "clean" them they mostly work. But recently my own 'matrix' DVD also encountered this problem.And this DVD is brandnew and not often used. So i hope someone out there is familiar with this problem and can tell me what the problem is and if there's any solution to it. Thanks alot for reading and i look forward to your input.