When receiving Direct TV signals at certain times, my HD100 picture breaks up and gives me a signal reading that varies from 0 to 70 on some channels - basically the locals and the sports channels. All high definition and OTA hi def signals come in fine. Then the problem will clear up and the channels will come in fine. The other boxes I have do not have this problem. Is there different processing within the box that would cause some D*TV channels to come in fine while others are a problem? I never have a problem with the D*TV hi def channels. Any ideas? Thanks - I'm using the eliptical dish with 3 lnbs and have had the system up for 1 1/2 years.