My Samsung DLP HL-R5667W is freezing up especially when I watch in DVR mode or another a/v input mode like dvd or vhs. It starts with no sound, then freezes up, goes black screen, then starts again. It goes through this cycle every few minutes. It did this when I had a dvd player hooked up with component cables and watching a show through my DVR. My cable box is hooked up with a HDMI cable and I had these issues in both live TV mode as well as through the DVR. I took it to a service shop and they said it needs a new light engine - $800. The tv is 4 years old and out of warranty. I am wondering if a light engine is the correct diagnosis? There were not problems with picture and/or color...just the freezing up. All thoughts are appreciated. For that price I can get a new tv.