Even I am experiencing same issue with an Indian model SM-G780F/DSM (SM-G780FZBNINS) after the Android 11 & One UI 3.0 update. Not sure issue is really with the software as this is occurring with ONE UI 2.5 as well. Service centre in India just runs diagnose test and hands back mobile mentioning no issue has been detected and simply advises not to use brightness adaptive option. Am afraid that I will ever think of buying any Samsung product. I have been using Samsung mobiles from past 12 years, but now I feel like it's time to switch over to Apple.
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