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Hi,
I'm sorry to hear that. I suggest that you send your phone to an authorized service center so a technician can examine your phone. It's only a technician that can conclude what's needed to be done after the phone has been examined. Check the following to get info how to get your phone repaired:
/t5/FAQ/How-to-get-your-Sony-Xperia-product-repaired/m-p/991374