Why is my phone restarting when playing games?

[Android Central Question]

When I play PUBG - Shadow Fight 2 (buyed version) - Baldar's Gate Enhanced Edition II my phone is restarting after playing a bit.
I have 3 GB free space and 500 MB free memory.
I even got more space, rebooted normal and in safe mode, factory reset, anti virus app, battery is in top shape,
I use Samsung Galaxy J3 2017.
I use all other apps no problem.

 

[B. Diddy]

Welcome to Android Central! Is the phone getting really warm while playing? If so, it might be shutting down automatically due to overheating.