My Alfred DB1 stopped responding and investigation quickly revealed that the Z-Wave device table was empty. The lock is 15 feet away from the hub, however, it is my only Z-Wave device.
I followed the instructions to power down the hub, disconnect f from power and power back up as mentioned here and the device came back
This happened a few hours after updating from 2.3.5.118 to 2.3.5.130. Might be just a coincidence. Nothing suspicious in the logs.
What might cause a Z-Wave device to disappear like that?