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Most laptops have protection built into the bios to shut down the laptop when the temperature gets to a certain height. It sounds like your cpu fan is going bad and stopping occasionally and then the bios shuts the machine down. Usually in the bios menus there is a page that shows all the voltages and fan speeds. I would monitor it for a while and see if the cpu fan speed goes up and down. If it does then get it swapped out.


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