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Go to your retailer first and if they say no change then send it in to repair.
Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
Just like KevinB said, you should send visit nearest service center to have your phone examined by a technician. You can contact your local support team for further information about how to proceed with this in the best possible way:
http://www.sonymobile.com/global-en/support/contact-us/contact-info/