So just something that I've noticed that I'm not sure if other people have encountered. But, When I have my phone on during a call in say a cradle in my car and I'm on a phone call on speaker; the screen goes black (as I would expect it to.) But when I go to wake it to end a call or go back to the screen, I can not double tap it or twist it to light the screen up again. I have to hit the sleep button or wait for the other person to end the call. I don't have a screen protector and my case does not block anything pertinent to the problem. Any suggestions or explanations. Love the phone and already satisfied with my switch from My Iphone to Android.