When I get incoming calls, my screen locks and says to push the button to access functionality or whatever. How can I stop this. I noticed that someone else had this same thing happen when they were listening to music. I am not listening to music. I do notice that it happens when my Bluetooth is on but the screen locks and won't allow me to depress the headset button and it doesn't respond to ANY button...Thus lost calls. Can anyone help me with this please?