Using a expresscard FW800; G-Raid drive unmounts on it's own

I'm using a NitroAV Fw800 dual expresscard to connect my 500gig G-Raid drive that i use for video editing. I have never had a problem with it using Tiger.
Ever since I upgraded to leopard it is behaving strangely.
I mount the drive and all is well, (this is an example of the problem I'm having with it) I used the drive to provide 3.8 gigs of info to burn a disk recently. It burned fine and when it was done the drive just sat there, turned on, mounted for a few minutes and then it unmounts itself.
When it's doing something it behaves fine, when I leave it alone for a bit it unmounts itself and I get the error saying that it has been removed without ejecting it first.
If I connect it via the built in FW400 port, it stays connected and I have no issues. other drive I have are FW400 and they behave perfectly.
I have never had this problem before. what could it be?

I spoke with the company that manufactures the expresscard (NitroAV) again and they said it is a foul up associated with upgrading to Leopard and not installing fresh and reformatting the hard-drive.
Has anyone else had this problem?
Is there anyway to have Apple address this problem?
thanks for any help.
Carlos

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_SMC RESET_
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Here are my specs:
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
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Off the top of my head, because I haven't worked with SCSI in years--
"The problem is that using the internal as the capture scratch can only be a short term solution. The drive is only so large and I have a problem with finder if I try to move files from the internal drive to the external. Finder freezes up and I can't even force quit properly. So being able to once again use the external as the main capture scratch is the only real solution. The external is fully functionally and communicating with the Mac."
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