My guess is that there is a weak connection between the two. Press and hold {INFO}, that's a good starting point. It will tell you if there are dropped connections between the two.
Weak connections can happen when the cables are too long, or when the connectors are a little loose. Whole-home DVR is a lot more sensitive to that stuff than regular TV.
Weak connections can happen when the cables are too long, or when the connectors are a little loose. Whole-home DVR is a lot more sensitive to that stuff than regular TV.