I recommend that you try to perform a software repair on your phone via our program Update Service to see if the problem persist. Download and install Update Service then follow the instructions in the program. You can find the program at the following link: http://www.sonymobile.com/global-en/tools/update-service/
If the problem persist or that you are unable to perform this software repair you should contact your local support to get further information about where and/or how to get your phone sent to a service center. You can find your local support at the following link: http://www.sonymobile.com/global-en/support/contact-us/contact-info/
