I'd appreciate any guidance about this problem I'm having. When I'm in the middle of a phone call and want to pull down the notification tab from the top left of the screen, which has the green phone icon there, the screen automatically goes black before my finger can even touch it. This means that if I open an application and want to go back to the call screen, I can't; it also means that if I get, say, a text message during my call and want to read it, I can't retrieve it through the notification bar. Has anyone else had this problem? It seems like something is messed up with a sensor, but I can't figure out anything beyond that.