Coolsat 4000pro. Scanned AMC-1 (W-1). PBS, Deutsche Welle, California Station will come in with a strong signal, but sometimes I will get no signal at all. Other channels on that satellite like ION will come in only when those first three have no signal. When those first three have signal, Ion and others have no signal. The DiSeqc setting is the same for all the programs. I can't figure out what is happening. They are all the same polarity. If I get some, shouldn't I get all the programs at once? Has anyone had a similar experience. Does anyone know what could be causing this?