I suspect that your overheating is causing the crash. Could you see whether https://help.ubuntu.com/community/DebuggingSystemCrash helps you provide any info?
** Changed in: linux-source-2.6.17 (Ubuntu)
Status: Unconfirmed => Needs Info
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System Crash when doing nothing for ca 10 min
https://launchpad.net/bugs/70035
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