I just got the Comcast High Def package just in time for the Masters and the picture is unbelevialble....but I keep having problems like frozen pictures for a few seconds or lines going thru my screen like a crossword puzzle? I have had to switch from the CBSHD channel to the regular CBS channel to watch the tournament. This is the only HD channel that is messing up so I thought it may be a national CBS problem? anyone else having this problem?