Capturing audio & video at different rates

I have a Panasonic PV-GS700 camcorder, and use primarily Sony DVC Premium mini-DV tapes. For as long as I can remember, when I capture a long section of tape (maybe the entire hour), I wind up with a clip whose audio and video are at slightly different speeds, getting more and more out of sync the longer the clip.
I spend a ridiculous amount of my editing time meticulously adjusting the speed of the video, and it doesn't always seem to be off by the same factor.
My capture settings are usually Firewire NTSC / DV NTSC 48 kHz but sometimes I have changed to "Noncontrollable Device" if I am capturing an entire tape and I don't want to get hung up on capture errors. The firewire cable is normally routed through a firewire hub, but I have also observed the same problem when it is connected directly to the computer.
I'm curious:
1. if there is some setting I can change to fix this problem with audio & video capturing at different speeds?
2. is it likely to be a problem with my camcorder or the software? Are there decks that just handle playback of mini-DV tapes and work reliably with Final Cut Pro?

The camera says 16-bit in playback.
When I'm playing the tape from the camera and watching the viewscreen, the audio & video are in sync; it's only the captured DV file that runs at different speeds.
At this point, I'm considering a newer camcorder which shoots in HD and saves to a hard drive or SD card, such as a Canon VIXIA HF200. Would such a audio/video sync problem even be possible with that sort of camcorder?
(PS: If you were anyone other than Tom Wolsky, I would definitely be dubious that there is any part of my camcorder called a "timing crystal"... it sounds like cheezy sci-fi or Napoleon Dynamite )

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Capturing audio & video at different rates

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