The reasons as below may cause the device power off automatically. Please eliminate one by one:
①The device cannot be powered on normally when the battery power is insufficient. Please charge your device for 20mins for a try;
②Auto Power off is activated. The device will power off automatically when there is no any action on it within the preset time. Go check whether Auto power off is activated in Menu>Settings>Auto power off.
If the issue still exists, please back up the data first, then perform Factory Reset in Menu>Settings>Factory Reset. If the issue still cannot be solved, please contact us timely.