Audio Drift

Hello all-

Here's the scenario. I'm digitizing DVCPro HD footage on set with a Mac Book Pro to a 1TB GRaid. All went fine on set. (Digitizing via FW I might add from a 1400 deck). Brought the footage back to the studio and and copied to my mac Pro and some of the audio was drifting. Set the capture offset for 6 frames and that seemed to help.

Things were then transferring fine (from laptop to tower) but now at the end of the day it's drifting again. The scary thing is, as you all know, there is no consistency. It works fine and then all of the sudden a clip will drift. Now I even saw the audio drifitng on the laptop and not on the copy.

Any thoughts?

Both machines running the the same version (6.04)

TIA-
Paul