Reference

#### The screen disappears/darkens unexpectedly.

The screen goes to sleep automatically after a certain period of time to reduce battery consumption.

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

- When you want to change the time before the screen goes to sleep, tap [ Apps & Widgets] - [ Settings] - [Display] - [Sleep] in that order to set the time.

- If you set the time to a longer interval before going to sleep, the battery will be consumed faster.