Why does my laptop shut down randomly ?

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To anyone who'll read this topic,

 

Recently, my laptop started to shut down randomly, at anytime and the most dramatic : on any software, even on Microsoft Word.

I downloaded CoreTemp to check if my CPU was burning or something else, because my laptop shut down in games (which were very performance consuming).

But earlier this morning (I'm in France), my computer just shut down while I was editing text on Word. Now I panic...

 

Did anyone already have this issue in the past ?

Did they solve it ?

If yes, please tell me how.

 

Thanks to whoever read my topic, I appreciate any sort of help.

My laptop configuration can be seen on my profile.