Watching FOX news around 7:30 pm and I notice an odd commercial for NBC nightly news. I think this is unusual for FOX so I try to back up a few minutes to re-watch it. The commercial is no longer there. Of course I think I may be going crazy but It happens again during another commercial break. Again I try to back up and re-watch. This time my Hopper 3 locks up and I have to switch channels. Is Dish substituting commercials?