Audio Video out of sync after Capture

I've read thru the Discussions posted but can't seem to find the exact same problem....
This has happened in both FCP5 and FCP6..
Last nite I captured wedding video into FCP6 from 2 identical cams with identical settings..The 1st Capture (18:00) went OK but the 2nd Capture of the same duration showed a window and transport bar. It stated something to the extent "analyzing audio". It's done this in the past and every time it occurs the audio is exactly 30frames off. The video precedes the audio by 1 second. It's easy to re-sync the two but annoying when it happens.
I'm capturing both videos into the same document so no settings change and the problem is not specific to just one camera. It has happened on both cams. I'm using the same tape deck to capture both videos and the same mini-DV tape brand.
Anyone have any thoughts?
Thanks

To nomadesign: I've not tried that. I use the tape deck to reduce wear on the heads of the camera. If I knew which clips would have this prob then I could use the cam which originally shot the vid. I guess I could go back and re-capture the footage which slipped out of sync using the cam which shot it just for a test.
To 2reverb: the video was captured at 48khz. When I first got the cams they were default set to (is it 34 or 36khz) and i discovered the prob very rapidly so I corrected the cams right then.
Thanks to both of you!!!!

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