Anyone else have this issue? Basically, I'll be on the phone talking, I'll receive a notification (whether its a Badge, Or a banner, And my touch screen becomes completely unresponsive. Can't end the call, Can't scroll through apps, Can barely do anything. This happened for the second time yesterday. I was attempting to hang up a call, A banner popped up, I couldn't click End. I tried holding the Sleep/wake button, The "Turn off" appeared, But I couldn't slide it. Anyone else have this issue?