From day one I have been having pixelation problems on my new 722. Dish has come out and rewired the house & moved the dish. Today I discovered a History channel recording from last night was totally unwatchable. I switched back to live TV and had very pixelation on the History channel. I went in to the menu to check signal strength and noticed the receiver was set for input to tuner 2, I switched that to tuner 1 and the pixelation is completely gone. I cannot find anything in the manual about the different tuners. Should I have the receiver set to one or two? If two is having pixelation problems should the receiver be replaced?