Gentoo System keeps crashing every 6 hours?

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http://www.linuxquestions.org – Ok this one kind of puzzles me. I was installing "wine" last night and since I knew it was going to take a while I closed the lid of the laptop and turned it upside down on the floor. (I always turn the laptop upside down when not using it otherwise might overheat) When I woke up this morning roughly 8 hours after I went to sleep the machine was turned off. Using the "last -x | grep shutdown | head -1" it stated that it went down at roughly 6 hours from when I went to sleep. The program I was installing got finished instal (HowTos)