I am an electrician doing sub for local cable co. , I know it's not really my problem but he happens to be my buddy and when im over watching a game on his big screen it gets annoying lol. Since then I have had the cable co. there and they say no problem it's the tv....but all tv's in the house have the same problem, more so on the big screen. And I might add this only happened when he got high speed, I checked the grounds no problem...all cable is quad rg-6 with snap and seals and high end passives. I'm stumped...even if I don't fix it, it would be interesting to know what the problem could be for future reference.