Up until last week we had three HR20s (HR20-700) still going strong on our system (6 total DVRs). Then one of the HR20s lost its satellite signal--constant "searching for signal on satellite 2" 771 error. Could still play from list, but no live TV. (Though it said "sat 2" nothing worked.) I confirmed all cables were good and connected/disconnected/reconnected, tried red button reboot and pulling plug and restarting to no avail. Took non-working box to site of other HR20, which was and is still working, and confirmed it was the box, not the cables/signal at that locale. (Didn't work on those functioning sat hook-ups either.) I wrote it off as simply a receiver that went bad and replaced it with an HR24 last week, which worked perfectly fine right off the bat, using the same cables/hook-ups as the failed HR20. Well, this evening, another HR20 has the same symptoms. Getting no signal. 771 "searching" message and reboots, etc. are no use. Again, existing recordings from the list play fine. Tests come up with a diagnostic code 40. The signal strength meters on our other, working systems, are all very high (mid 90s or better). Both units were on less frequently used TVs and I'm not sure when either was watched last prior to the discovery of the non-working sat. I know the last thing recorded was 7/28, which would have also been close to the fail date of the other HR20. I think we may have recently had a guide update, as the menu looks a bit different. Not sure if that is potentially connected. Seems weird and funky that two same-model units would fail the same way, at the same time. Final HR20 is still working, at least as of this post. Any ideas for recovery? Is this potentially fixable? Or guesses on why this has occurred? Thanks in advance for any insight you can provide. EDIT: See update in post #4.