Hey everyone, ever since the 4.3 update, I have been getting an icon in my notifications bar that looks like a shield. When I pull down the menu, it tells me an app has tried to access my system and it has been blocked. I don't allow apps from unknown sources, and have deleted nearly every app from my S4. Any ideas.? I am honestly kind of disappointed in my S4 for a few reasons.... It's always been a bit "laggy", the screen rotation is quite slow and some apps are Very slow to open. I have been tempted to switch to my GN2 that I have, it's a reman, but I have never used it. My original GN2 was flawless in every way.... Except that it can't swim.