Hi, for the past few days I have been getting the error 771 on my HD-DVR (I believe its something like HR22-100). It works fine all day, and then at night, the image just stops wherever it is and brings up the error--if you change the channel, it stays black, but the error goes away. I checked the satellite strength and it all looked normal (except for three at zero, all above 70 with most above 85 and several at 97-100) and the other three SD receivers are fine. Of note is that it's been exceptionally cold lately (-5 and below, especially at night) but otherwise there's been no unusual weather to report. I called DirecTV today and they're sending a repairman next Thursday, but if possible I'd like to resolve this issue sooner. Obviously I don't want to wait almost an entire week.