Do you have any ghost zwave devices?
I had the same problem with my C7 zwave
I had to delete a ghost device using my Aeotec Z-Wave Z-Stick and how to delete zwave ghost devices
After it was deleted I shut down the hub.
After the hub completely shut down itself.
Then I unplugged power from the hub.
After a minute I powered the hub back on.
All the zwave devices started working again.
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