Unusual OTA reception

Has anyone had the situation where their NBC HD comes in kind of jerky? It appears that the audio is off from the video and the video is about every 5th frame. I switched to another station and came back it seemed OK for a minute or 2, then started again. Don’t know how else to explain it. I’m in 77345 with CM4228 in attic bringing in NBC at 98 to 100%.

Last night NBC was having problems apparently. I had to watch something else.

Tonight's opening ceremony was jumping like watching a HD slide show. I hope they get this fixed by the time the competition starts. Must have been a station problem as it was doing the same thing on the sub-channels also.

Same thing happen to me when I watching NBC sitcoms on Thursday. I notice something that they're playing around with the audio. I turn on my surround sound to watch the show. Before the sitcom was broadcast in DD5.1 but when commercial start it switch to DD2.0. Now the commerical is broadcast in 5.1. My theory is that they're trying to "upscale/upconvert" the audio to 5.1 even when the audio was originally 2.0/stereo thus causing delay/synching problem.

I could be wrong though but that's what I observe. :)