Why is the audio asynchronous to the video after I've exported my project in iMovie?

Hello,
I've started a project in iMovie which lasts 25 minutes and 59 seconds. Everything is allright but when I've exported the whole project for example to iDVD, the audio gets asynchronous to the video.
The videos are mostly recorded with a Flip Ultra HD.
I use a Macbook PRO 13".

Hi, I'm having the same issue.  There are a number of threads on this topic, but a lot of them were around the 9.0.1 release of iMovie 11.  One suggestion that seemed to help several folks is to detach the audio from the video clip so that iMovie encodes them separately on export.  I understand you can do this in the event/clip editor, not in the project editor, but haven't had a chance to try it myself, planning to try it tonight.
For reference, I'm running a early-2011-model i5 MBP with Lion and the latest iMovie from Mac App Store.  My video has a combination of .m4v, and .mov(AIC) source files and is about an hour long.  The video and audio during the longest segment get out of sync in the export, although it seems to self-correct every once in a while, as if the software realizes it's out of sync and resets.  Everything plays great in iMovie itself, of course.

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