Thanks for the advice - this thing is driving us crazy.
I will give the unplugged reset a try.
magnum2066 - I can see what you mean. I am leaning towards bad tuner or LNB. The system was installed brand new in November 2008, so it has not been in place that long. This is the second receiver...maybe third. The only thing that would make me lean away from a bad LNB is the fact that I have seen this behavior on channels served from two different satellites. That would implicate two LNBs, which should be less likely.
Here is a little more data from last night:
We were watching NBC from 129 and simultaneously recording it - just watching what we were recording, and staying caught up with live TV. Just hitting mute on the commercials. Might as well have been 1990....
We had been watching the broadcast from the beginning - actually from before recording started, and it was flawless.
When a commercial came on, my wife switched over to start the recorded stuff that we had just watched live to check if the recording was OK: The recorded show that we had just been watching was completely pixellated and unwatchable.
She switched back to the live program - it was also unwatchable, though 10 seconds before, before we checked the recorded version, it was great. We went through the check signals routine, and all was well on the live version.
Next commercial, we switched from watching it on the satellite feed to watching the same channel from the OTA tuner. Flawless OTA.
Switched back to the satellite feed of the same channel (10 seconds before, it was perfect), and it was unwatchable! Went through the check signals routine, and it came back.
Next commercial, we recorded for a few seconds, went to check it, it was OK. Came back to live, and the channel was shot. Check signals fixed it again.
Sorry to rant here - I am sure I come across as a whiner. But this thing is really frustrating.
I am wondering how to explain what is going on to a CSR - often they have no clue about how things work, and I can talk to three different ones, and get three different answers. They will first say "turn if off for 30 seconds, power up and let a check switch run", which in this case seems kind of useless. In the end, they will either send out a technician (the last one did not really even want to get out of the truck - they were running really behind that day, and a high-level supervisor was supposed to drop by their shop, and they were all in a panic), or send me a new receiver. I have been told to cut 3 different trees to improve LOS on 129, but even now, with no leaves, the best I can get is about 41....