Random screen dimming

[dc52ltr]

Have this on my 10 pro xl, can happen at any time, reading a book, you tube, anything.Usually have screen brightness around 85% then screen will suddenly dim but brightness percentage level remains the same. Checked the usual adaptive brightness etc but I haven't changed any settings... Anyone else have this?

 

[B. Diddy]

Do you have your Colors option set to Adaptive or Natural? If it's Adaptive, what happens if you change to Natural?