Tvheadend

I've recently had a couple of recordings that "missed" where the program changed channel a day or so before the airing.  This is normally a sports broadcast.  I'm thinking I might have something set wrong on my zap2xml run but not sure what. My "missed" what I mean is that tvheadend records the proper timeslot on the original channel but missing what you watned to record because it moved.

Anyone got any suggestion on how to fix this?  Maybe some cache setting in tvheadend