Asus X510U Restart Automatically

[shamaltech]

I have a Asus X510UN laptop came from a customer.
The problem of that is, it restarts randomly.
I tried flashing Bios,Changing ram,hdd and also reinstalling OS & drivers.

Any guide to diagnose this issue ?

Asus X510UN
i7-8th Gen
2GB Nvidia VGA

[FriedFred]

Probably something gets too hot and therefore makes a restart.
Or maybe there is a broken solder joint.
If you press down firmly the CPU/GPU, do you have still this behaviour?