If I set the refresh rate to "adaptive" and then watch Amazon Prime, the videos stutter/jerk very noticeably. If you tap the display once while it is jerking, the jerking goes away and after a short time (10-15 seconds) it starts again from the begin...

A bigger or wider clear button in quick panel to remove notifications. 

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There is no 4k option on a33 and a53 but has the option available on A52 series. Both a33 and a53 run on Exynos chipset is that the problem