QT exports but audio goes out of synch... Fixable?

I'm exporting some rather large timelines to QuickTime from FCP 6 and all of the resulting QT files are losing audio synch. Actually the audio tracks are stretching, it seems: the audio tracks are LONGER than the corresponding video track, each time. Longer by 1 to 2 seconds.
SOME FACTORS
My files are around 25 minutes long.
I'm preserving my current settings when exporting with QT.
codec XDCAM EX 1080p24 35mbs VBR
frame rate 23.98
frame size 1920x1080
48.0khz audio
Is it simply that I shouldn't try to export files that are this big? I searched the existing archives. One person had the exact same problem, apparently, but there were no replies.
Anyone know the situation here?
Shanked

Hey Venturesome,
I've heard of things "floating" out of synch whenever you're exporting to QT with files of a particular length or longer. Back in the day, this magic file length was 5 minutes. I have no idea what the current magic maximum is... or if there even IS a maximum. If you've got synch issues inside your timeline without even exporting, I wonder if it may be you're using mixed media.
But I defer to the forum at large on this -- anyone know why our audio and video tracks float out of synch upon exporting (or in this other case, non exporting)?
Shanked

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