My Toshiba Satellite laptop Modle L840D shuts down at random.  Why does it do that?  My OS is Windows 8.1 and the laptop is about 18 months old.
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That is usually caused by heat. Take a can of compressed air and blow it through the intake and exhaust ports of your laptop until no more dust comes out - you probably want to do this outside. Next, power your computer on and check to see if there is a breeze coming from the exhaust. Is the fan spinning?
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