I also have this problem. I dropped my phone about 4 feet from my bed to the carpet floor. My phone has an Otterbox on it and a tempered glass screen protector at the time. The protector was cracked but not the screen; however, the screen has a very thin black line that sometimes disappears. The line goes across the screen about where the volume keys are. Underneath the line, the screen will flash white and yellow color and it usually takes six presses of the power button for my phone to allow me to unlock it. When using it, the portion of the screen changes colors frequently. I have had the phone since December, and now I am re-thinking my choice of phone and gearing away from Samsung after this. Especially for a $300 repair when I can get a Moto unlocked for $300 as well.
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