Okay, I am a certified installer but I am having some problems with a customer's 311's. They are remans because thats all our corporate retailer will send us, anyways here's what's happening. The 311's will show a picture and then go black, they will have sound, but come back on searching for satellite signal. It is the weirdest thing that has ever happened to me. So I replaced one of the 311's and it went to working fine until later, when I installed it I ran all brand new cable swept to 3.0ghz, it's the copper clad RG6 from perfect vision. It's a brand new dish with a brand new quad LNB. I don't know what the problem is whether it is software, hardware, or what. I would like to know what you guys think, because at this point I am stumped!