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Repair / Update Service
Update your phone for optimum performance and get the latest enhancements. Regardless of whether you have the latest software, it’s a good routine to run the Update Service to improve software stability. Also, if you experience problems with your phone this may be solved by a software update.
Same here repaired it several times! Problem still exists after repairing. Seems like a software problem
Drain your battery completely 0% then charge till 100% hope this will fix your problem...
Now you need to wait for another update to fix or take your phone to sony service centre 