Just had our pvr replaced last week. Now after watching a pvr'd show the screen freezes at the end. The old pvr would show an option menu and then go to screen saver if nothing selected. Pvr is on our plasma TV and my wife often falls asleep with the tv playing and I dont want anything to burn into the screen. I looked through the options in the menu but found nothing about screen saver settings. Box is a cisco isb 7150. Thoughts?