Sound and Video not in sync

Dear Forum,
apologies if I happen to ask something already treated elsewhere (I searched and didn't find)!
I'm having the following problem with my 3rd gen Nano: in movies longer than around 20-25 min sound and image progressively get out of sync. The sound runs ahead of the picture - after around 45 min the shift can be several seconds. The video is encoded with EyeTV (the "iPod best" setting) in H.264 at 640x480, 25fps, around 1.6 Mbps. This should - according to the nano specs - be fine.
Has anyone else come across this?
Does anyone know of a fix?
Thanks very much!!

same issue here.
no fix

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