amarjitsinghroshI haven't faced any such restart issues (except when screen sharing on Discord, but was resolved after) but the message have been clear from moderators that you will need to visit service centre for this problem.
While in games it automatically turn off
amarjitsinghroshFor heating issue (not overheating), I would let the phone cool down before I restart playing the next match again - common sense but simple to do and reduces the damage on the phone when it reaches high temperatures. It's one reason as to why your phone would restart - it's to protect your phone.
Over heat problem and suddenly off automatically
amarjitsinghroshThe last update version .103 came out last week - I would still wait for another week to see if you get any updates. If you are still on Android 9, clearly there is something wrong with your phone potentially a phone with a combination of Tencent hardware with Global firmware flashed. But for this, you can download the firmware from here and place in root directory of internal storage and then reboot your device:
No notice for updates version