![](http://pdfasset.owneriq.net/a/7a/a7a66d03-0673-4d09-ad32-127fc1da86b1/a7a66d03-0673-4d09-ad32-127fc1da86b1-bg8b.png)
The screen brightness is not stable.
When you set automatic adjustment of the screen brightness, the screen brightness is adjusted automatically according to the
surrounding brightness.
Tap [ Apps] - [ Settings] - [ Screen] - [Brightness] - [Automatic brightness] in that order to remove the check mark.