S21 ultra game screen stoping problem

[hariiiroye]

I have s21 ultra but when I put it on charging and play pubg, the screen stops working Does this happen with other people too or is this the problem only with my mobile and have you solved it? Please guide me. 

[hariiiroye]

And when the mobile gets hot it also turns up the brightness

[walioo]

Brother change the charger and cable