IMac G5 Sound Dropout

Im having a very annoying problem with the sound output on my iMac frequently dropping out. Im using a USB Digidesign MBox 2 with speakers connected to it as my sound output and input device. Trouble is if im playing music in iTunes, or using another audio-related application at the same time as im using my airport the sound will randomly cut out and i need to restart the application or unplug the MBox 2 to get the sound stream back.
The dropout problem has been happening pretty much since I got my iMac back in November and has also occured when using more than one audio application (eg: Reason and iTunes) at once so im not sure if its driver related or not. I've check for driver updates but there are none.
Any suggestions or help solving this annoying problem would be very much appreciated
Thanks!

I've always had it plugged into the back of my iMac, plus i've tried it in all three USB ports so that it's displayed on its own in the USB Bus part of the System Profiler. It's very strange. Im not sure if it has something to do with the CPU load, as ive noticed today that the dropouts occur easier when the audio application im using is taking up more CPU %, and also when i've been using other USB Midi devices at the same time (keyboard and midi controller)

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