I've had a problem with mine at 4:12 AM Mountain Time (standard or daylight-savings) for a year. Even this week I had both 722s set to record a one-time show and they were stopped by "User 1" 1/2 hour after I quit watching. The reboot times are different and not near this time, ever. The 6 remotes are set to unusual addresses above 10 by the installer including a 622 in the house and my closest neighbor and only local Dish user AFAIK is not up then. I have not even had obvious extraneous changes during the day. I think it does not stop if it is not in standby, e.g., if I am watching it. So I guess for those nights when I need to get a recording across that time, I will just leave it on or maybe just one to verify this problem.
Dish 1000 WA, Dish 500 single at 61.5, DPP44, 30' dish to 722s, southern neighbors > 400' across canyon.
-Ken