Chiming in on this issue as I had my cloud backup fail last night and this morning zwave became totally unresponsive (all devices). I suspect the zwave issue preceded the cloud failure by a few hours (more on that below). I got everything back running, but I'm writing to get some advice on what to do to prevent the chance of a recurrence.
Here are my details:
Stable network
C8 hub on 2.3.9.147
Powered by original power brick
Wired network connection
42 zwave devices and stable mesh for last year
Two successful cloud backups after upgrading to 2.3.9.147
I made only one change in the week between my last successful cloud backup and last night's failed one. Three months ago I excluded a GE Enbrighten series 700 dimmer 52252 (Closet Light) for some construction. I added it back six days ago, but this time instead of it being S2, I included it with no security.
I noticed no issues with my zwave network over the last 6 days, except last night, when I noticed some lights were left on in the basement. Some were lutron and one was zwave (basement shower light). I turned them all off using apple home around 10pm. However, I noticed that the basement shower light appeared to still be on. I though maybe someone was using the shower and moved on. There were no issues with zwave earlier in the day.
Looking at the events for that device, I can see "command called: off" at 10pm but no "Basement Shower was turned off [digital]" so this command did not succeed and I wonder if the entire zwave network was down, but I didn't notice. I looked further back in the event for this device and can see that "Basement Shower" had successfully executed digital commands after "Closet Light" was added back without security.
I took three steps
Step 1: Trigger another cloud back up. It succeeded and my zwave devices became responsive.
Step 2: Shut down hub, remove power for a few minutes, powered back up.
Step 3 (housecleaning): Switch a battery powered zwave motion sensor (GE 39143) to being mains powered.
Any theories as to what happened and ideas about what to do? I'm thinking exclude and include the closet switch again?