Do you have other Z-wave devices in your network? I believe this can be due to some older/lower security level devices, what might be used as a hop through the route to the lock.
@RBoy is the most knowledgeable person around regarding locks and their operation on Z-wave networks. He might can give some insight. Indeed he has a list/table providing information which lock capable to do and what with ST and with current firmware/hardware limitations. Unfortunately I cannot remember the topic or address where it is, but he can help definitely.
I didnt get that message and I’ve got the v2 hub aswell. I would suggest logging on to the IDE and see if the lock is connected direct to the hub as @GSzabados suggests above.
Other than that unless Smartthings have changed something I’m drawing a blank cos mine works fine.
Have you logged in via the web to see if the connexis is directly connected?
I had a problem with a yale contact sensor continuously dropping and I found that for some reason that was connected via a socket as a repeater, connected it directly to the hub and no problem ever since.