Help with to fix code 771 - DirecTV

My dvr box and live TV in one of the rooms is not working , it shows the error code 771. I called direct TV 3 times and it works for about an hour then it tries to reboot it's self and is not recording and the recording from the other dvr are not playing all the way through. Help me

This question, "Help with to fix code 771," is about DirecTV channels, programming, equipment, and sports.