Audio Sync issues since FCP 4.1.1

I'm going to give a brief description of my problem and I just need to know a few things.
Now, Batch, Clip capture all give the same results. Panasonic AJ-D250 deck capturing into final cut 4.1.1 through to 5.0.4 via firewire. It doesn't matter what kind of mac and how much memory it has because it has happened on 3 different macs all the way up to the new G5's purchased 6 months ago, starting from a G4 866. I have tried everything, changing the settings on the deck, following panasonic technicians specs on what the deck settings should be (which I recieved a few different settings each time) Changed every setting in final cut pro, different firewire cables, heck we even have 4 AJ-D250's and they all slip out of sync after 20 minutes (7 frames out of sync) and slippage increases with time. Installing FCP 5 for the first time it was out of sync 5 minutes into the capture.
According to Panasonic, it's apple problem. They also said that apple knows about it and says it's their audio codec.
What I would like to know is where do I find this audio codec. Supposively (because I haven't been there when this happened) everything was good with FCP 3.0. So that being said can I use that audio codec with FCP 5.0?
I know it's FCP because I have used quicktime to capture the clips...perfect capture, I have use myvcr to capture the clips...perfect capture, when we had iMovie installed...perfect capture.
And to add to that depending on the DIF setting in the VTR, renders different but consitant results in the audio capture, DIF Audio=DVCPRO (audio drop out 'flatline audio' for 1.5 frames randomly throughout capture) DIF Audio=DV (audio spike for 1.5 frames randomly throughout capture) None of this happens with the 3 above mentioned programs-quicktime, myvcr, and iMovie.
Any ideas?
Andrew

Is this the 12 bit audio problem?
Patrick

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