Ok I understand that where I m right now is very hot but it doesn t mean the screen should dim that much to the point I cannot see almost anything,IT IS A FLAGSHIP TO THE END OF THE DAY
also it lags like crrraaaappp
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Your thermal guardian settings are working as expected.
Everytime your temp has gone beyond the threshold you've set, it has kicked itn and successfully brought down the device temp.
If you want to reduce throttling, raise the temperature threshold to get a hotter but more functional device.
And "FLAGSHIP" is just an unofficial word without any real meaning. It does not automatically make a device infallible. Every manufacturer has lemons and for last couple of years, the most powerful Android chipsets run very hot, there's not much that can be done about it. It's happended before, and may happen again.
Sadly, we just have to live with it or change the device to something else that runs cooler.