Sometimes I get slight dimming of the picture every 5-10 seconds on my 622 (about 3 years old). The guide also dims. Last night this was happening while I was watching an old episode of Lost and recording it to my DVD recorder. The recording (on the HD of DVD recorder) did not do the dimming. My TV with OTA antenna feed (not from Dish) did not dim. I turned the 622 and TV off and on again and then it was fine. Anyone else ever see this?