I have been having this issue for quite some time. Watching via Joey, picture freezes and Hopper reboots. They have changed the Joey, the Node, the Hopper, and all connectors on both of the wall plates and yet it still occurs. I don't know if this is what you are experiencing or not but it is very discouraging since we usually only watch via Joey in the evenings when we retire for the night and is disrupts any recordings we have going at the time.