Laptop switches off at random

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https://bbs.archlinux.org – I run a dual-boot Windows7/Linux laptop with an i7 quad-core processor and 4GB of RAM.On Debian, I was having an issue where out of the blue, I would be typing and suddenly the keyboard would jam -- whichever key I was pressing would just repeat -- and  then the laptop would eventually just switch off, with no shutdown procedure.After I installed Arch, this stopped happening.. until last night, when this issue happened 3 times within a space of 2-3 hours. At all times the only thing running was a web browser (Firefox).Features:There is no overheating involved as far as I can tell (the cri (HowTos)