Dell G5 5500 shuts down while playing games

Hi

The laptop is shutting down (or hibernating) while playing games such as Doom Eternal and Call of Duty. I tried to monitor temps and noticed that it keeps at 80 - 90C, and after some minutes, the CPU Throttles reducing drastically the performance and then it shuts down automatically.

I've read that these temps should "be acceptable" so I'm guessing there is something wrong if it as it is shutting down suddenly while playing only.

Sometimes the laptop freezes and after some minutes it shows the BSOD and restarts it.

Can someone help me with this please?

Thanks!