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Consider wiping your phone by performing a PC Companion phone repair, this will do a clean installation of the latest firmware and will also wipe your internal memory.
Open PC companion -> Support zone -> Phone/tablet software update -> Repair my phone/tablet (blue link style). Follow the steps given, do not connect your phone until prompted to press volume down while plugging USB cable.
Do not forget to backup your DATA while re-installing the fresh copy of your software through PC Companion 
Mine is working like a charm since the update haha, very happy