Dvr programs deleting as soon as they finish recording

Programs keep deleting themselves some as soon as they finish recording. We can't keep any programs on the DVR! And there is plenty of space since it gets down to 7 programs and still they just vanish even as your looking at the list of programs. 

We have reset the main router and main DVR box many times as per AT&T's request but that does nothing. Everything comes back up and programs still delete themselves.