Optical out shuts off after some time without being used

Hi,
I bought a Mac Mini to run XBMC on my TV. I connect the video out via HDMI to DVI and optical out to my sound system. It works great when I first start using it but when I return (usually a day later), I don-t get any sound. Restarting the application doesnt fix the issue and neither does logging out of my profile. A software reboot fixes the issue.
Has anyone encountered this issue? Any suggestions on possible fixes?
Thanks, -d

Hallo Tobias
You must understand that nobody here will be able to offer exact diagnostic and say what is wrong there. We can just speculate what it can be.
Such power problems are not easy to repair and mostly it has something to do with motherboard and power supply electronic or something else.
If you think BIOS battery is empty connect your notebook to the AC power supply and leave it ON about 48 hours. RTC battery should be full charged.
To be honest I don't believe problem is RTC battery. There must be something else. Anyway try to load RTC battery to see if there is some change to earlier situation.

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