I just bought my first hdtv and just had a cablecard installed and have noticed that sometimes on the digital channel I get lots of digital interfirence and the sound flickers like a cd skipping. If I see it on a channel I can switch to a different channel then switch back and it will be gone and so forth. Sometimes its worse, and sometimes its not there at all. I have a lg52x4d dlp. The interfirence looks like a bunch of blocks making the picture pause in spots. Any help would be great, Ive tightend every connection I could find.thanks