Have you tried this?
There are a few things you should try first when you experience problems with your device:
- Press and hold down the power key. In the menu that opens, tap Restart. The device should restart automatically.
- If the restart procedure described above does not work, press and hold down both the volume up key and the power key . After the notification light flashes once, release the keys. The device should restart automatically.
- Update your device to ensure that you have optimal performance and the latest enhancements. Read more about how to update and find latest software version.
- Reset your device to its original settings to free up memory: Settings > Backup & reset > Factory data reset > Reset tablet. Don't forget to back up any important data saved on your device!