When I touch my contacts icon, the screen turns blue as if it were going to load the list, then goes back to the original screen. I cannot add a contact, when I try it says, "The application Contacts (process com.sonyericsson.contacts) has stopped unexpectedly. Please try again." "Force close". When someone calls, the phone recognises the person then. It's just starting going wrong for no apparent reason. What has happened? Does anyone know how I can put it right?