My NBC HD channel here in Atlanta is not working correctly. I get intermittent sound and the picture continues to pixalate. This is also happening on Channel 743. It is only happening on these 2 channels which are NBC.
do you have more than one outlet/TV connected? if so are they all getting that same problem? What you describe is called pixellation due to low signal and/or high noise level on the coax line on some channels. A tech visit will verify the signal is 'good' outside your home. do you know your wiring set up (splitters amps etc?)
I forgot to mention that I called support and they ran some tests and told me they couldn't send a tech but they were working on the problem. It cleared up so maybe they found something. If it reoccures I will check or replace the splitter.