Whenever I record a program the length shows 30 min or 1hr for a 1 hr show after the recording has completed. The problem is that the PVR does not record the last 1-2 min. So there's a clock problem somewhere. Either the online clock on the box is incorrect or the show starts 1-2 min late. Can I fix this. I tried to set the end time 2 min later but it doesn't always let me add 2 min.