Well I found that when I have AOD on and I receive a call and press the slide to answer and answer the call, when I put it in my ear to talk, screen goes off (correct) but when I move it away from my ear (to see the screen), the screen has a delay to show and stays black for 2 seconds. If I unlock the phone during call the delay goes away! Of course everything works ok when I call someone (because the phone it's already unlocked). Proximity sensor works great then. So what I mean is that proximity sensor is slow to lighten screen when AOD is on in an incoming call. If AOD is off proximity sensor works as it should in incoming calls. So I think it's a software issue and not hardware probably. Any thoughts?