Thermal throttling won't shut games suddenly. It will lag like crazy first. Then, if it's too hot, phone will warn you and then shut down apps. If required, the device only will be shut down.
Don't charge phone when gaming, if possible. If you have to charge, disable fast charging to reduce heat.
Check Digital Wellbeing settings to see if you have set app timers. Also, PUBG itself shuts down at times if you play for too long (check PUBG settings too).
3 reasons:- 1.Either you accidentally touch back button. 2. Either you have set app time in digital wellbeing. 3. Either you have set play time in pubg settings.
Please perform the below mentioned steps to resolve the issue:
1. Uninstall the unnecessary apps. Too many apps installed on device may cause the device heating issue.
2. Long duration of graphics intensive gaming sessions may cause the heating issue. Avoid long gaming sessions.
3. Usage of mobile phone when charging may cause the heating issue. So we recommend you to avoid usage of mobile phone while charging.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > click on “+“icon > send feedback > error report/ask questions).
