Fri Nov 24, 2017 11:15 am
Check if you have any sceen overlay apps active (like for light dimming at night).
If nothing helps you could try to install the latest firmware and perform a wipe/factory reset*
* wipe data/factory reset in recovery (this will delete your data/settings):
- Power off and then press Power and Volume-up together for around 10 Seconds
- be sure that the little arrow point on recovery (select with volume up, enter with volume down)
- Then the open android with red triangle+"no command" is shown - press Power and Volume up together again
- Select Wipe data/factory reset with volume keys, confirm with power
- After factory reset select reboot system now
Please report if this solved your issue or not.