Galaxy S4 Issue with Update

[Glenn Ward]

I received an AT&T update a few weeks ago to Android 4.4.2. Ever since, my phone has worked horridly, with the screen sporadically going black, the screen not responding to swipes, or worse (phone rings and no display) and I've had the error "Touch Wiz has quit responding" pop up at least twice. Is there anyway to fix this or in the alternative revert to the previous version?

 

[B. Diddy]

Welcome to Android Central! If you haven't tried already, clear the system cache partition: Reset: Samsung Galaxy S 4 | T-Mobile Support. This can sometimes improve various issues after a major system update.