I had put my Nexus 4 on charge and after 10 minutes when i came back to check the status of battery level, i turned on the screen normally,(disconnected it from the charger),and i went on to UC to check my updates on a website. When i pressed the home button,it came back to its home and i think it froze. Now, i tried pressing the power button over a minute but it remained on the home screen and the phone didn't shut down . But the most amazing part is - when i repeatedly pressed the power button, the screen light goes off yet when i press the button again,it reaches me to the frozen home screen without any change . Need help ...