Noise glitch with firewire cable

I noticed on one of my projects with FCP that an noise glitch occured with firewire connected for video monitoring, but the noise glitch disappears when the firewire cable is not used and computer audio is used instead. The short split second noise is not on the audio track, but is part of the video track and can be eliminated by turning off the video track. My take on this is that the firewire cable is transmitting a noise glitch when it senses a video irregularity? Anybody else noticing this and is there a fix? This is a problem when recording to tape.

Yep. I've had that happen. I do some editing for a production house that doesn't like to ship the camera masters, so they make dubs to send. Occasionally, when I get a tape that's been used a few times, I get the little glitches. It's like there's 'almost' a dropout in the tape, but not strong enough to see it. And the signal seems like it's strong enough to play by the computer, but when you send it through firewire, it's just too much to stay locked.
I've tried recapturing, but the problem still happens in the exact same spot.
I just have them make new dubs and throw away the tapes and it takes care of the problem. It's not your cable or your system, it's the tape.

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