DVR not working - DirecTV

The DVR is not capturing all programs set up to record. When I go to watch the recorded program a message pops up to delete yes or no but no recorded program. It is happening different days on different channels so does not make sense at all. I also have 50% free space and no more than 2 programs at a time. Help!

This question, "DVR not working," is about DirecTV channels, programming, equipment, and sports.