Droid Ultra home and back keys not working?

[AC Question]

Stated yesterday. No known changes to the phone. I have tried reboot. Version 4.4.
Help?

 

[B. Diddy]

Welcome to Android Central! Try booting into Recovery and clearing the cache partition. https://motorola-global-portal.cust..._id/93895/p/30,6720,8697/kw/cache/action/auth

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