I am new to Dish (about 3 weeks now) and I have noticed that I am getting brief pixelization on random channels and random times on my Hopper. It usually last about a second and the screen gets distorted (part of the screen breaks up into blocks) and usually the sound breaks up. If I rewind I see the distortion. I have also noticed it once with an on demand episode (Game of Thrones) with similar issues. Is this normal? I did a diagnostic test and the signal strengths all appear good (green). What troubleshooting can I do? It is random and I am not sure a tech would be around long enough to see it happen. Possible HDD issue? Planes flying over head - not flying really low though???