This is a follow-up post to this recent thread: http://www.dbstalk.com/showthread.php?t=186970 In brief, had HR21 with intermittent 771 errors, wildly fluctuating transponder readings, culminating in zero transponder readings across the board. eventually had zeros all the time (but originally would start, weirdly, at night at about the same time, 10 PM). Bought hr24, and alll was well for three weeks. Last night, remarkably at 10 PM, got the 771 errors, zeros on the transponders, etc...and could not past the 771 errors on two resets. Exhausted I turned the tv off and this am, signals are rock solid. When everything was going to hell, I checked my other two dvrs and they were just fine. I even had a tech out here two days ago to inspect my dish and connections, so I doubt a hardware failure at the dish/swm. any insights? weird about the timing no? there are other posts re: intermittent tuner failure (from '08) solved by returning for replacement, but am unclear still about possible cause.