So I want to record a show, let's just say Thursday at 8:30 on CBS. I use my guide to go to Thursday at 8:30 and then I scroll to CBS and hit O.K. The timer menu then comes up and and says it will start 1 minute early and end 3 minutes late. I hit O.K., but when I play back the show the ending is cut off. If I edit the timer to end 5 minutes late all is O.K. This happened on my old receiver and on the hopper. How come 3 minutes is not enough?