Apple TV video playback issues

I'm on my second refurb. 160GB ATV and it is having the same problem as the first one a exchanged it for. When I play back video (purchased TV shows and movies created in imovie 8 and imported into itunes) the video will sometimes hang or skip about 2 to 5 minutes into playback. This will not happen every time and will not happen in the same place on the video every time. I have rented several HD movies from itunes and they have worked perfectly. I have talked to apple support and took the first ATV into the genius bar, where they ordered my a new refurb. ATV. Now the same problem is happening with this ATV. I am syncing my ATV and have all music on video in the ATV Hard Drive. I am using ATV 2.1 and itunes 7.7.
Any thoughts are appreciated.

how full is the atv?
because harddisks performe worse and worse and
more full they are
at 75% full it become a big problem
fragmentation of data would also be a problem and solved by a factory reset
and a full new sync but that should be rare and would be strange if you had this issue 2 times
also if you encode your video yourself and choose a strange settings that could also be the problem
and of cause if you hacked it to play other stuff then normal m4v and mp4 stuff that could be the problem
Message was edited by: Rudegar

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