C8 2.3.8.125 Z-Wave 7.18.1
I've had my Z-Wave radio lose all it's devices 3 times this week. I've been able to recover them by shuting down the hub, pulling power for 30+ minutes and restarting.
Z-wave Network Graph (I have 9 pages of z-wave details, happy to provide, but didn't here.
Alan
So I'm assuming Z-Wave devices stop working and you go to the Z-Wave Details page and it's empty, or ? Can you describe how you discover the issue and how/where you are seeing them all gone?
I hope you are shutting down, then pulling power, etc. You can use the hub Diagnostic Tool at hubIPaddress:8081 if you have problems getting to the hub UI. You didn't mention that so can we assume the hub UI is still fully functional when you are having problems?
Also, 30m is much much longer than required to refresh the Z-Wave radio, 30s is plenty. Did you try the normal 30s and find you had to leave the hub off for longer intervals for things to come back, or did you just use 30m from the start?
Have you looked at your Z-Wave details page for ghosts? Typically you'll see no info in the last column - Routing. If you don't want to post all 9 pages, take a look and post screen shots of any devices on your Z-Wave Details page that are missing data in the Routing column for starts.
Have you looked at your logs to see if you have any devices/automations throwing errors? You can filter your Logs view to show Warn or Error entries:
You can also look at your App Stats and Device Stats pages in Logs and see if you have any devices or apps eating up a lot of your hub's resources.
Thats the symptoms of Z-wave radio crashing. Do you have Hub Protect? Have you checked if the Z-Wave backups are failing? Sometimes a failed backup will crash Z-Wave and it is a known issue that HE devs are working on, should see more fixes on the next platform update.
No notification indicator in the window he posted above, so didn't seem like it was a backup issue...that notification doesn't clear until a successful backup is created.
I will try 30s. I thought it was 30m, but no big deal. I have no errors from devices. As for ghost ones, I hadn't added any new devices when this started.
You can get ghosts w/out adding any new devices...I had one pop up the other night. Something happened and one of my Z-Wave blinds lost routing and took my Z-Wave mesh down, hard.
So do check for ghosts on your Z-Wave Details page. Post screen shots of any devices lacking routing, showing a Pending button/message, etc.
Hub Protect: but I haven't reloaded from backup. I did have a failed backup that said it couldn't backup the Z-wave devices but that was only the first time. I was able to create a new cloud backup after the 2nd restart.
You may be thinking about inducing Zigbee panic mode, where all Zigbee devices rebuild their neighbor tables. To induce that you have your hub off/unplugged for 20m or so. 
Happened again. Here is a screenshot of my Z-Wave Details:
I loaded a cloud backup to one of my other C-8s and the devices are still there on it. I'm going to shutdown the original hub and switch over to the "new" one and see what happens.
If you do have ghosts, they will just transfer over to the other hub when you restore the cloud backup. Also, remember that cloud/LAN integrations may need to be updated w/new HUB UID.
So you are migrating to a spare hub to see if it possibly a hardware problem? A worthwhile test if you have an extra hub to use.
So, any device without a routing is or can be a ghost?
Here is a portion of my Z-Wave Details (from new box) showing devices with Names & No routing plus one with no name and no routing.
Corrrect. Since it just popped up with a known working hub.
So far, the new hub is fine (Z-Wave Details). I have repointed to the new hub for all my HUb Mesh devices. This hub only has Z-Wave Devices, apps and cloud stuff run on different hubs.
Alan
Yeah, you have a mess, unfortunately. All of those that are mains powered and don't have routing are likely ghosts. Sometimes things can clean up somewhat if you do a shut down/pull power/wait 30s/restart, but if this screen cap is from after you did that, then you're going to have to work on removing all of those ghosts.
To clarify - the screen cap is from the original hub, or the hub you did the cloud restore on? If the Z-Wave Details screen looks like that you are going to have problems.
Not necessarily. A migration would have cleared all the routing to be rebuilt.
Also, I think sometimes when Z-wave crashes the routing will go blank for a short while. Battery devices can take 24hrs or more to populate.
Usually a ghost is a z-wave node with no "device" attached to it and often has no routing. Especially for failed pairings, there is no device. Looks like you have two of those. A ghost with a route, is possibly still a live device, or just has a cached route.
You can also have nodes with a device, no route and that do not respond to anything. These could be ghosts as well if the device was reset, broken, or dead batteries.
Yeah I wasn't clear, I was thinking that came from his original hub, but he was talking about both hubs. But if it came from his new hub then it could be just all the routes are filling in, as you note.
Sorry, I keep getting interrupted. I was going to ask the if that is from his first hub, that means he transferred those ghosts to his second hub, where they will still need to be dealt with.
Sorry for the delay. This las screen shot is from the "new" hub. I removed the one device that had no name and no routing. Then I tried to remove "d3" which only has a "Refresh" button and it said "No responding".
The others on the list without routing, but has a device name, are mostly not present. I will remove them. But serveral are and not showing routing "Front Deck: Double Outlet", "Back Deck: Cabinet Light", Guest Bedroom: Overhead Light" for example
Thanks for your help,
Alan
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