A different problem. On all my recordings the sound drops out for a second or two any time during the playback. Sometimes it's after 10 minutes, sometimes after an hour. Very annoying but also very consistent problem.
Another issue with the glitchy Hopper 3 w/ Sling.
mec1, Do you notice the issue with your Live TV? If you press HOME 3 times on the DISH remote > Status>Check Status> any red boxes or errors?