Wipe your cache partition. (Simply connect your device to the computer via data cable (or just insert a c-ported headset) > Switch off your device >Press and hold, power button + volume-up button for 4-5 seconds till the phone turn on and boot into the recovery mode. Use volume keys to navigate to 'wipe cache partition.' Use power key to select and confirm. Then reboot your device. This will not effect any personal data or settings.)
