Before performing any troubleshooting steps on this phone it’s best to make sure that it is running on the latest software version (by going to Settings > Advanced > Software update > Check for updates). If an update is available then we suggest that you download and install it first.
Perform a Reboot
A soft reset is usually performed to refresh the phone software. This action fixes minor software glitches which could cause issues on the phone.
- Power off the device
- Press and hold the volume up button and don’t release it
- Now press volume up to select recovery
- Select Reboot system now
Once the phone boots up check if the issue still occurs.