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I'm sorry to hear that. But if you have tried with a software repair via PC Companion but the problem persist, it sounds more related to a hardware problem. I suggest that you visit nearest service center to have the phone exmained by a technician. You can contact your local support team for further information about nearest service center and/or how to proceed with this in the best possible way:
http://support.sonymobile.com/global-en/contactUs/