I am having lip sync problems. Not all the time though. It happens quite often on Discovery HD and HDNET. But it happens on my local Boston stations too (not HD). I have thought of one of those audio delay units, but since it does'nt happen all the time it would'nt be worth getting. I have HD DVR: HR10-250, AV Reciever: Marantz sr6300, DLP TV: Samsung HL-R6168W. Any ideas for a fix? Ihave talked to different techies from these companies and they blame the each other. I also have a DVD player....There is no problem with lip sync when DVD's are playing.