Audio goes in and out of sync when burned dvd played on standard DVD player

I made a short film recently (7:00 mins) and once completed and burned to DVD using iDVD and DVD Studio Pro about 20% of the clips have out of sync audio. Just slightly out of sync. Some more noticeable than others.
Playing off the timeline syncs perfect, the exported prores 422 mov file syncs perfectly, and if the finished DVD is played on my mac or my pc the sync is perfect, but when played on a standard dvd player to my TV I get the syncing problem, but only at certain points through the film. As I said, about 20% of it. The rest of the film is fine.
Shot on Canon 5d mkII - footage converted to prores 422 1920x1080. Audio recorded on Zoom H4N with some ADR recorded on logic pro. Audio synced manually using clapper board reference. Using a 27'iMac with current OSX update as of 14 March 2011. Edited in FCP 7, exported to proress 422, burned to DVD with current iDVD and DVD Studio Pro, all current versions and updates.
I have tried exporting to mpg4 and mpg2 - no joy. I checked audio bit rates and discovered the logic recorded stuff was 44.1khz as opposed to 48, so I converted to 48 but still no fix.
I am STUMPPED
Any suggestions?
Cheers
Dallas

Should I convert just the clips which are out of sync in the DVD, or all of theclips in the FCP timeline?
If that is the issue, wouldn't I have the problem in the final prores mov as opposed to just when its played dvd to tv?
Ill try it though. Its an odd problem so its likely to have an odd solution. Willing to try anything at this point.
Thank you.

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