I keep getting random pixelation problems with my HR24 HD system. The tech came out the other day and replaced the box and all seemed well but by the next day the pixelation had returned. Signal strength is very strong so I don't suspect reception problems with the dish. Some days I get far more "glitches" than others. Here is my question: Can a bad LNB be causing this problem, or is it likely to be a problem with the cable from the dish to the house?? I have also replaced the BBC boxes but this didn't make any difference either.