Audio out via USB plays briefly , then shuts off

Hi,
I'm running version 10.4.11 on my iMac. I'm sending audio out via usb to an audio device (dac), the audio will play for a while and then just quit. This happens using iTunes or another music player I have on the iMac. This problem is recent, I have been doing this for about a year with no previous problems. Could an OS X update have caused a problem with the usb audio output? Anyone else experiencing this issue? It's become quite aggravating.
Thanks!

Yes.
http://www.griffintechnology.com/products/imic/

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> http://eshop.macsales.com/item/Newer%20Technology/CBLAOPTMT/

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Thank you for the details of the issue you are experiencing with your iPhone. I would be concerned too if my iPhone was only turning on when connected to power. I found an article with steps you can take when you encounter an issue like this. I recommend following the steps below:
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If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
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Contact Apple Support.
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http://support.apple.com/kb/TS2802
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Audio out via USB plays briefly , then shuts off

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