leptop shurt down

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yes Sir I am using my Laptop regularly Toshiba satellite C55-A 5302 . I was checking all of the air vents are clear .and some overheating all Leptop but exact after 30 min this laptop is off no be four 30 min and no after 30 min .you pl help me
yes Sir I am using my Laptop regularly Toshiba satellite C55-A 5302 . I was checking all of the air vents are clear .and some overheating all Leptop but exact after 30 min this laptop is off no be four 30 min and no after 30 min .you pl help me
 
Solution