My back button and app list button doesn't work (Android 7.0)

[AC Question]

The OS recently updated and the back button and app list buttons stopped working on my Galaxy S7. I installed a new update and am now running kernel version 3.1.31-10280464, dpi@SWHE7702 #1 , from March 16, 15:50:15

Any ideas how to fix this?

 

[B. Diddy]

Welcome to Android Central! Was that an official system update over-the-air, or did you manually install it? Have you already tried wiping the cache partition? https://support.t-mobile.com/docs/DOC-24999