Video is faster than audio after capture....

This is a problem that keeps popping up here and there. It's weird. I will do a capture from a Mini DV tape to a external Firewire drive and when you play the clip in FCP the video is played faster than the audio. When you put it on the timeline the audio is the correct duration but the video plays much faster and then just has black to finish out the clip.... The really funny thing is that when you go directly to the clip in the finder and open it with Quicktime it plays just fine. But when you put it back into FCP (new project and everything) it will just keep playing the video faster than the audio...