This is what mine does and exactly at this rate. Which makes me think it must be a design flaw causing interference of some sort. I haven't thrown my tv out because I believe there be a fix available, but so far I have not found one. I talked to a guy at a repair shop who didn't even want to look at it! He assumed it would be an expensive repair. I am not sure this would be true, but so far no one has answers for me.
