Welcome to Android Central! If you haven't already done so, try wiping the cache partition, which won't lose any important data:
- If your tablet is on, power it off.
- Press and hold Power until the device powers on, then immediately press and hold Volume Down (while still pressing Power). You will see the word Start with an arrow drawn around it.
- Press Volume Down twice to designate Recovery mode.
- Press Power to restart into Recovery mode. You will see an image of an Android robot with a red exclamation mark.
- While holding down Power, press Volume Up.
- In the Recovery Menu, highlight "Wipe cache partition" and execute.
- When done, Reboot System Now.