Wondering if someone accidentally deleted the code from the lock itself or the lock reset itself or someone reset the lock causing it to delete the codes (from the string of updated default and deleted messages).
You can do a Z-Wave repair and see if that helps restore your lock comms.
BTW, if you’re using the LUM app to program your codes, its sure programming engine can detect if codes are deleted from outside the app or if the lock is accidentally reset and then tries to restores the user codes automatically, so you don’t need to worry about such situations.
It also helps to add a repeater within 20ft of your lock which can help with communication issues and mesh problems.