MacBook with 10.6.2 drops audio when using firewire audio interface

Hi there!
I've got a problem that's getting a pretty big issue right now.
It started when I first plugged in my newly bought Alesis Multimix 8 FireWire, at the moment running 10.5. After a while, the audio suddenly was gone, there was nothing. Unplugging and replugging the interface solved the problem, but it happened again, and again and again. I could also change the sample rate and the audio would come back. I hoped it was an issue with Leopard, so upgraded to Snow Leopard, but the problem is still there.
At the moment I'm in the band for a musical, and it requiers a lot of different sounds, and I'm happy I found MainStage in the same box as Logic! Though with this audio dropout problem, it can't be a success. I borrowed a TC Electronic 24D from a friend hoping all troubles would be gone, but no, it's still there.
Now, I can't figure out where the problem exist. Is the two different sound cards both failing? Is the MacBook hardware failing? Is OS X failing?
I tried with different FW cables, but it didn't help. Could there be some bad stuff left from Leopard when I upgraded, I didn't do a clean install?

I have a hard time believing it could be just OS X that's messing with us. If the problem came already in 10.5.3, following my logic, the bug should be gone by now.
As you said, the easy fix is to use the built in headphone port, but in my case it doesn't work that good since there's some whining noise making itself clear when you amplify the signal.
I've read somewhere that people have had success not plugging the interface directly to the Mac, but through a firewire hub of some kind, like an external harddrive. I will try that tomorrow.

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