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For hardware issues you think you may have you are best to either return your device to the place of purchase or contact Xperia care and have it inspected http://www.sonymobile.com/global-en/support/contact-us/
Possibly - Depends on who repaired it and if they put the phone back together correctly and caused no damage to any connections
i had a xperia t and i repair the micro usb port,after 1 mounth my phone acts like your's.
when i take ir to another store to repair it a man there said that the other one that repair it made a mistake and mader board had a syndetic.