I have an issue with my note edge screen dimming and couldn't figure out why it was doing it. Now i know why. It seems that the sensor at the top is locked in semi auto mode at all times. If you go from a bright room to a dark one your screen will slightly dim as if you have the auto brightness checked. I took my phone to the Samsung store and they tried to fix it but couldn't. They said that there might me an update to fix this issue but right now there's nothing they can do. To check if your phone has this problem just go to a bright room and cover the proximity sensor with your hand and you will see your screen dim. It shouldn't do that. All my settings are set so the screen stays bright but this phone is defective.