Sound sync problem I don't understand

Hi. First post.
I have video with audio from the camera captured into iMovie. I also have separate audio from the same event through a firewire mixer into garageband exported as aif. (One of these days I'll get it all working into final cut).
My goal is to use the "firewire" audio with the video track. The video has a 10 minute gap in the middle, but the audio is continuous.
So I synchronize at the beginning, no problem. I then cut the extra audio piece out of the middle, and synchronize the beginning of the second part, no problem.
The first part is in perfect sync, beginning to end. But the second part goes increasingly out of sync the further into the timeline we go. I don't understand why the first part remains in perfect sync, but after cutting a little, the second part can't be sync'd up with the video track. Any ideas?
Thanks in advance,
Howie

I am using Final Cut Express to do the editing.
The camera video/audio was captured from a Canon XHA1 in 4:3 SD mode into iMovie, and then exported to a quicktime movie, DV/DVCPRO-NTSC 48khz.
The "high quality audio" was captured via firewire into garageband, edited for levels on different tracks, then exported to itunes, then converted to aif, 48khz.
Both were imported into FCE. I rendered the audio for playback. I don't have any red lines in the sequence (I'm a beginner at FCE).
The out of sync problem was not part of the original video clip. It is with the external firewire audio BUT only with the second part of the video... i.e. the second video clip from iMovie. The iMovie capture had two clips, exported together into the single quicktime movie that was imported into FCE.
So maybe it has something to do with the two different video clips in iMovie... but I don't know what the difference could be.

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