Audio playback is slowed and cuts in and out

When using FCP 6, my 2'31" sequence began to behave strangely. The video plays at normal speed, but the audio plays in "slow motion" (for lack of better term). I would guess that it's playing back roughly at around 80% of the normal speed.
It also cuts out at random intervals, and after the sequence is paused and started again, it will generally play no audio at all. To even be able to hear the audio in "slow motion," it will only play if I start from the beginning of the sequence again.
Both my project and project files (captured video, audio, render files, etc.) are on running off an external hard drive. I've done many projects using an external and its never caused any problems, but I want to give as much information as may be needed to get this solved.
I've browsed several FCP forums and I can't seem to find anyone experiencing the same thing.
Any suggestions?

We have the problem even when we use only the internal hard-drive (MBP Core 2 Duo). The problem exists also in the exported (rendered) files....
With stereo, one track runs at 100% velocity, the second track with 80%. When we have multiple tracks (first track A, then track B) sometimes the track A works fine and the problem comes with track B... or track B works and the problem comes with track A.
But the problem exists also when we have only one mono track...

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Audio playback is slowed and cuts in and out

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