FCPX Squirrely Chipmunk Audio

I have a feature length documentary that sporadically but maddingly has the audio of random clips suddenly sound like Alvin & The Chipmunks, requiring me to delete the offending clip & reimport from original media. Anyone know what causes this & ways to solve and/or prevent this issue?
http://youtu.be/Wp22haYzDbw
MacPro Quad Core Tower
17GB ram
200 GB free disk space on Firewire800 drive
100Gb+ free disk space on tower
184 minute film
Thanks,
Chris

Your timeline and inspector aren't cclear enough in the video to provide any clues. Post a screenshot of those windows.
What format is the media you're working with? Are you using any compund clips?
Russ

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FCPX Squirrely Chipmunk Audio

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