I am having a minor problem with my decks. I have 8 DVCPro's for playback of our stations programs and I notice that they have been slipping of the timecode when I cue them. For example, I cue the tape, stop it, zero out the counter, and when I come back a hour or so later, the tape has advanced 5-15 seconds! It's starting to screw up my plackback pretty good. Any one know what's up with this?