I have a SV-4000 hook to a 1M (motorized) dish. It has worked well so far but for a while I have sheen more and more channels go dark on 97W (no signal or signal with no info on transponder). Would it help to get a new receiver with new firmware (one with HD)? I just watch FTA and have been out of the loop so long I don,t know what is working now. What is a good main stream receiver? (SV-4000 has latest firmware)