Error Code 771 - DirecTV

We keep getting an error code of 771. Only on 1 receiver. Our DVR receiver. It's been happening since we got the service... 4 months ago. We done every trouble shooting thing we can! We've had a tech come out like 4 times. They've replaced everything! Lines, receiver... Nothing has worked and it's pi$$ing How do I get this fixed bc I'm ready to cancel it!

This question, "Error Code 771," is about DirecTV channels, programming, equipment, and sports.