Reference

The touch screen does not work as expected.

    Make sure you are using the touch screen correctly [Details].
    If the touch screen is damaged (scratched, etc.), contact the service/support center named in the warranty.
    If the touch screen does not work, turn off your tablet, and then turn it on again.
  • If you cannot turn off your tablet, press and hold the power button for about 10 seconds to force it to turn off, and then turn it on again [Details].