I have been experiencing 771 errors and weak signals on my dish for some time now. Some days everything would work fine others not so fine. I finally had the dish realigned and all my problems went away - or so I thought. Last night I was watching the NFL draft for about an hour, when all of a sudden I started to get pixelation. Very slowly at first and then much worse and then 771. Some channels still came in while others did not at all. I quickly realized that the problems started exactly when the upstairs DVR started recording two shows at 9pm. The box that I was watching also started to record a show at 9pm. I have two HD DVR's with an SL3 LNB. I am pretty sure that there is nothing wrong with my boxes. I am also positive that my dish is correctly aligned. All signals prior to last night were in the 90's or high 80's. My thinking is something is not working correctly on the LNB, or should I be looking at the PI?