Searching the forum, I see this has been a fairly common problem. My DVR is at 59% so that's ruled out. I have some programs on there from 4 years ago so it's not deleted those automatically. There i...
Almost every morning I check my DVR if I lose a bunch of stuff just for no reason except that the DVR was rebooted and just deleted them for the hell of it. Last night I lost at least about 10% of my recordings.
The only thing really in common is that they mostly recent ones. Like I lost all of my Nationals and NBA Playback recordings for the last 2 weeks.
The only thing I can figure and I am just guessing is if you do a recording during the time of the daily reboot not only will you lose your current recording but a lot of stuff around it gets messed up. I tried changing my time to 4 - 6 in the morning and see if that helps.
I don't know why people pay for this service. You spent the time, effort and money to schedule recordings, but the hardware defies you by just arbitrarily deleting what you've done for no apparent reason.