Hi There,
The problem you’re describing sounds like it could’ve been overheating at one point (hence the switching off suddenly).
It’s possible that you might just have a loose component i.e. RAM, GPU or CPU etc. because of the constant overhearing (think thermal expansion & contraction).[br]
Worst case a component might be damaged because of the overheating.[br]
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To check the former you’ll need to take the laptop apart entirely, if it was overheating you’ll most likely see a lot of dust in the cooling system i.e. on the fans and inside the heatsink/s, you’ll need to clean these components properly with a fine brush or with some compressed air if you have it.
On the cooling heatsink/s you’ll need to remove the old thermal compound/paste with some rubbing alcohol and a q-tip.
You will need to buy some new thermal compound before assembling everything back together though.
Hopefully after assembling all back together your machine will start up again as per normal and run cool with the cleaned cooling system / new thermal compound.
If the above doesn’t work then a component might be damaged and you will need to test the components one by one, in this case it is best to take it to a repair shop that will have the spares/equipment on hand to test these components properly.