I have a HR-20 and it seems, more often than not, during playback, the sound and the picture are out of sync. I have tried pausing, rewinding, fast forwarding, skip, back skip, pressing play, pressing List and then exit, and have even reset the receiver with the red button inside the card door, nothing helps. I have watched a program and seen that the audio sync is on during live view, and then played back the recording and it is off. I notice it when watching playback of recordings on OTA locals, but not during live viewing, and not all the time, so I doubt if it is the channel. It also seems to vary in severity. Sometimes it's way off, and others it's only slighty off. Any ideas?