I think the zwave radio is offline. Try this endpoint, if it times out the radio is offline.
http://HUB.IP/hub/zwaveVersion
You need to fill in your hubs IP from the address bar
You could try going to the diagnostic tool and doing a FULL RESET to see if that brings it back online. Just boot up clean and check the endpoint again.
PoE could be an issue?
If still offline, warranty claim: Warranty – Hubitat Support
