The screen disappears/darkens unexpectedly.

The screen is turned off automatically after a certain period of time to reduce the battery consumption.

• The screen turns on again when you push the power button.

• When you want to change the time it takes to turn off the screen, tap [ Apps] - [ Settings] - [ Screen] - [Timeout] in that order to set the time.

• If you set the time to a longer interval, the battery will be consumed faster.