Having some reception issues with my HD-DVR's. Picture is breaking up once in a while and other times the sound will drop out for a second or two. On a few occasions I have seen the 775 communication error. Does not seem to be affecting my HR-21 only the Genie and HR-24 units. If I unplug the power inserter for a bit they will work great for a while (Sometimes all day) Power inserter is near the Genie behind the TV Stand. SWM16 is in the attic protected from the elements, there should not be a corrosion issue. Looking for ideas on what may be the issue?