IMac20" with firewire audio-interface konnekt24D by tcelectronic

Hi folks,
I've got some cryptic problems with my iMac and the connected firewire audio-interface (konnekt24D by tcelectronic). I'm running MacOSX 10.4.10. The problem is that after four days working with no occuring problems I got no sound output. When I restarted the Mac the blue firewire light of the audio-interface disappeared and the tcnear control panel says 'no device'. I decided to update the firmware and then everything runs properly for one day. The next day I got the same 'no output' problem. I decided to update the firmware again but now the blue firewire light disappears and I got 'no device' message from the tcnear control panel. I started the Mac again but the interface was still gone. Now I switched off the Mac and turned it on again. The interface was there and I had output. Next day I got the same problems.
The tcelectronic support said that I should disconnect any other network cables, enable every network setting on the network control panel and connect the power supply of the audio interface. I did everything but got no improvements. The people from tcelectronic concluded that my audio-interface could be defective. So I went to my mönger and he gave me a new one.
From now on everything worked fine for three days. During this time I changed nothing on my setup. No new software was installed, the only thing I did was to start LogicExpress 7.2.1 and begin with my work. After three days I got the same 'no output' problem again. Now I think that there must be something wrong with the iMac. It is the 'old' version (bought in May this year) and I don't know exactly what to do now.
What I don't understand is that both devices worked a few days and then the problems occured. As I said before I didn't changed anything, installed no new software, etc. Maybe the harddisk of the iMac is defective? I've plugged the audio-interface into the other firewire port of the Mac but got no improvement.
I don't know exactly what I should do know because I worked ten years with a PowerMac/Audiomedia III/SCSI system and never had such strange problems.
Greetings to all of you,
Dorsch.

Check out this thread here:
http://discussions.apple.com/thread.jspa?threadID=1656583
It appears that sp3 has issues with firewire. I'm seeking a solution too, short of reinstalling as this person suggests. See also his link re: the famous little patch. I tried that already to no avail. I'm using SP3 too. My firewire behaves like USB... which would/could cause issues like you're describing.
Mike

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