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...

I am getting a glitch in my picture about every 10 minutes. I am using the 5 LNB HD dish and an HR-24 box. This is occuring only on satellite channels (not OTA coming through AM-21 tuner). The HR-24 box has just been swapped out and the problem still persists. What else might be causing...