On both of my Joeys and the main Hopper, Skip Fwd/Skip Back are incredibly unpredictable and make watching DVR recordings unusable. Moving from a ViP722 to the Hopper, all I used was the Skip buttons because Fwd/Back was too hard to use... But As I am about half way through a 33 minute recording, I skip forward twice (on the Hopper), then it tells me the recording is done, and I can go back to the DVR list.
Same behavior seen on both Joeys.
Basically, if I want to have to restart the recording, I use the Skips. I've transitioned to using the straight Fwd/Back buttons, and the more powerful processor in the Hopper is nice - the fast forward video is easy to see where I'm at. But these skip buttons gotta work better... It seems like a poor software issue.