Toslink Signal Dropping Out Occasionally

Hi
I have my Mac Pro (Early 2009 with OS 10.8.2) connected to a DAC using the toslink connection however when listening to music with iTunes the music drops out approximately every ten minutes or so. This happens just for a very tiny moment, but it is rather annoying.
Using my MacBook Pro (Early 2011 with OS 10.8.2) connected to the same DAC with toslink does not have this problem.
I have tried using a couple of different toslink cables with my Mac Pro but the problem is still there.
All the music files I listen to in iTunes are Apple Lossless is burned from CDs I've purchased so they are 16 bit / 44 kHz resolution. It is not high resolution.
I've tried shutting down all the applications on the Mac and using only iTunes, but the problem persists.
It occured to me that maybe there is disc fragmentation, however the hard drive is 1.36 TB free on the 2 TB disc, so I think that it would be unlikely to be fragmented.
I wonder if anyone has any suggestions?
Thank you.

ayam,
Your PC may be passively listening on a particular channel for the signal different than what your iMac may be listening to. You may want to consider testing various channels using the steps noted in knowledge base article http://docs.info.apple.com/article.html?path=AirPortUtility/5.0/en/ap2085.html
Regards,
Chris

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