I have been having problems with my Samsung P-721M DVD Player playing back DVD-R's. Everything works fine, but thee last 20-30 minutes of the film, the DVD starts skipping. Any ideas? Player problems?? Has anyone had good luck playing back DVD-Rs on any of the new Sony Progressive Scan multi changers? (400+). I am looking at getting a new player to see if this solves the problem. Any help would be good.