When the touchscreen of Kwikset 916 Z-Wave SmartCode Touchscreen Electronic Deadbolt is not responsive:
Try activating the screen by touching the screen with either your palm or back of hand until you see the digits illuminate.
See whether you gave a one-second pause. Generally the lock would need a one-second pause after locking or unlocking for the touchscreen to re-activate. So resolve this issue by removing your hand fully from screen until you see the Checkmark or Lock symbol turn off. Then activate the screen once again.