Why does my Toshiba Satellite Laptop shut down randomly?

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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