My Galaxy S3 has also been experiencing a flickering screen, but it's not a change in brightness of the screen, it's more like a vibration in the graphics when I'm changing screens, doesn't matter what I'm doing, unlocking it (flickers for about 1/10th sec) then settles, flicking between home screens (flickers) opening/closing an app (flickers) sending a text (flickers)...you get the idea. I've tried turning it off and back on and that seems to help, but it comes right back and I can't figure out what (if anything) is causing it. Is this similar to what others are experiencing?