I'm not sure if this is something that I should be worried about as far as my HR21, but maybe someone has heard of this happening before. Yesterday all of my HD channels started to stutter both with audio and video every 5-10 seconds, it looked like a poor signal issue. However the signal readings showed all mid to high 90s on all TPs on 103c and 99c. Also my H21-100 in my bedroom had no problems, no stuttering at all. I did a red button reset and when it came back up, it continued to do the same thing, lots of stuttering. So I then decided to initiate a full software download (out of desperation) and since then it seems that the problem has disappeared. So I'm glad that it seems to be working now, but it seems like a strange way to resolve a problem like that. Has anyone else heard of this happening before, and has it ever come back? Thanks.