I updated mine from FI22 to FL24 about a week ago. Now every now and again when I am talking to someone the screen will not come back on during a call if I try to do something else and after I hang up with the person the screen will not come back on either and I have to do a battery pull. I tried calling the phone and it rings but not my ringtone, just a regular house phone sounding ring tone and I have no way of answering it.