Rog phone 2 shutting down

Phone shut down when
. playing pubg in HDR Quality
. playing pubg and charging
. playing Asphalt 9 in 120 hz
Problems started when updated to Android 10 last one .
Now i downgrade to A9
STILL HAPPENING 😭
I live in iraq there is no customer service
Any advice please 🙏
............
[Updated]
There's an app in play store
( 3DMARK THE GAMER'S BENCHMARK)
I used it to test my phone every when i hit the run button the phone shutdown after 10 -30 second ,i think there is an issue with the GPU
My question : It's possible to downgrade or updated software to fix this ?
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Comments
Have you done factory reset?
Yes I did that and also
. factory reset in fastboot mode
. downgrade to A9 version 1910.64
Today I installed A9 version 1910.35
And Tested again it's the same and the system temperature is about 40 c° when it happen
Let the device cool down, Please visit service center.
Unfortunately the only thing that will help is a repair