Z-Wave lock user codes not being sent

I am having difficulty with setting lock code times with with lock. A couple of weeks ago, I was able to set the times when a specific user was able to use their code to gain access to my front door lock. Now, when I give access to that user, my lock doesn’t grant it. Is there difficulty sending the user code times to the lock? Or, is this a problem with the lock itself?

When was the last time you tried to send the user code?
How far away is the Lock from your main panel?
When was the last time you changed the lock’s batteries?