I am using Z10 since 2 months. OS Version - 10.2.1.2977 After fully charging the device, when the battery level drops to 65-66%, the phone shuts down automatically. It does not start up by pressing the power button. To start the device, I have to connect it to the charger. Then to use it, I have to again charge the device to 100%. I performed a factory reset by using blackberry link software on my pc but no solution. The problem persists. What seems to be the problem?