Sometimes when I am receiving a call, the screen doesn't transfer to the call screen. I have to open the main screen, go to the phone icon, and press a menu option that says "return to call in progress". This happens when there was no other call in progress and the phone is laying on a table (so I don't think it's the sensor). Also sometimes at the end of a call the phone skips the call screen and goes to the home screen, but it will show the phone icon in the notification bar. This doesn't happen every time, but often enough to be aggravating. Can anyone help?