I have recently noticed what I hope isn't a sign my screen is failing...or something. When I wake up, put the phone to sleep, the bottom 1/3 to 1/2 of the screen flickers/flashes greenish, with horizontal lines, prior to the image appearing/disappearing from the screen. I have also noticed this flickering, with the image on, while the phone is docked bedside. I was using Dock Clock Plus and thought it may be an issue with the newest app update. I uninstalled the app and haven't noticed it with the default Samsung clock. However, it continues to occur with the wake/sleep activation.