Headpone Jack - Optical Software Glitch?

Help-
I have a Macbook with the intel core duo. 4 GB of RAM.
Context.
Computer is used as a media server. Stereo is connected via an optical link from the headphone jack to an external digital to audio converter. Music is stored on external 1 TB My book. Computer is left on and idle for extended periods of time.
Problem:
As the computer is left idle, the trackpad/mouse become increasingly unresponsive. Eventually they stop responding all together. Un-responsive means they jump and can not be maneuvered around the screen in smooth movements. System fan begins to run as this problem gets worse and system monitor indicates memory continuing to be consumed despite no applications running other than startup apps. ---*When the optical jack is removed from the headphone jack this problem disappears*--- and the system returns to normal.
Please help. I specifically purchased the macbook to serve as the platform for this media server and leaving it running for extended periods of time with no use is normal for me. Having the computer lock up because I have the optical headphone jack plugged in is unsat.
Thanks -

i've had this happen on a couple of occasions, and like you it was specifically when the appletv was changing back from 5.1 to stereo.
I haven't had this for quite a while though (and never at all on v3.x), and when I did have it I was only using HDMI (so no optical connection).

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Description:
Stopped working
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Problem Signature 01: rim.desktop.exe
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Problem Signature 03: 4f2bf8de
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OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 2057

Headpone Jack - Optical Software Glitch?

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