When I try to playback a recorded program, the recording freezes for a few seconds and continues to play. Sometimes, it freezes and the recording stops. Instead of going back to the live TV channel, the screen is blank. Changing the channel will bring the picture back to the screen. Some recordings freezes more than others.I have tried unplugging the power, but it doesn't help. Sometimes, it can freeze 3 or 4 times within 5 minutes. Sometimes, if freezes only once or twice during a movie.