Quick history - was running a C8. Everything was running well. Had the idea of buying a C8 Pro, migrating to the C8 Pro, and then wiping the C8 and having it available as a spare.
The C8 Pro is running 2.4.4.146. I did not migrate to Z-wave JS.
The migration went fine. After migration everything seemed to work great.
Starting yesterday (almost a week later) - I saw some warnings that a device failed to respond after X tries. that happens sometimes - and I just would go in and rebuild that one node, and then normally everything was fine.
Tried that this time - and got an error that the device didn't respond / couldn't be rebuilt. So I tried to rebuild the device that was between the problematic device and the hub - and that device also failed (even though it's direct).
I tried to run some direct on / off commands from the hub on devices that hadn't been reporting problems - and got no response from the device.
it was like the Z-Wave radios stopped working.
yesterday I shut down, unplugged for a couple of minutes, then powered back up. after that everything worked fine.
this morning had another error from a device, tried to rebuild it - same issue. tried to control other devices, and had the same issue.
just powered down, and powered back up - and things are working again.
I'm far from an expert - but on the zwave details page - I don't see any nodes without names, or anything else that looks weird.
any thoughts?
Same device that you had to revisit periodically?
To me, not an expert, you could have a failing device that's bringing the mesh down. It just takes one.
The C8 is unplugged?
edit: antennae screwed in well (but not too well, lol). I've had luck with moving the ZW antennae when one device was weak, but I'm on mostly LR.
Good moning,
Would you mind showing:
- The events and logs sections of the initial device having the issue?
- The section of the Hubitat logs during the timeframe for the same device?
- The device type
- The z-wave table
Of course you can redact any information you may be concerned that would reveal any sensitive information (i.e. IP addresses, etc).
Thanks,
Don
so the c8 was wiped, I powered it back up, and turned off the zwave radio. so it's on the network - but not configured and zwave logically disabled.
so the devices that would occasionally fail make "sense" to me - those that show routed through at least one other node, showing low bandwidth, etc. however, historically when I would rebuild one - it would rebuild fine.
any way to help isolate a failing node?
so here are some logs. the first one(s) was me trying to rebuild the node.
then me trying to activate a room lighting scene - showing all the devices in that group failing:
and finally a screenshot of those same devices responding after a shutdown, power off, power back on:
the devices in my home are almost all enbrighten dimmers and / or switches. some items I added later were zooz.
and finally the z-wave details output. apologies for multiple pics, I couldn't get safari to export the entire thing as a single pdf / file.
Have you watched the logs in Zwave Settings for the problem device? It could give you some clues... does it say network speed is 0, or there are no logs at all, or are there tons of logs, like it is spamming the network?
It looks like device Dining Room Art was the initial problem (decimal 14). According to the z-wave table it currently has a direct route to the hub. So neighboring devices relaying may not be the issue. I say may not be since it looks like the hub may be last rebooted sometime this morning before 7:30am.
Can you provide the device log for this specific device? Unfortunately I have to head to a Board Meeting and will not be back until about 3pm. I would love to continue to help anyway I can after then. So sorry I have to rush off.
I'm totally no expert, and I don't mess with multiple hubs, but unplugging the old hub would give me reassurance.
Where the devices were once connected to the old hub you may have a point. Like you I am no expert and know way less about Z-wave than anything else.
I do though have two hubs with Z-wave running on them and devices connected to both hubs. I have no issues with those devices on either hub but they were never connected to the same hub. I have zero knowledge if that would make a difference.
Overnight failure is classic, at least for me, lol.
I had one long "woke up to slowww world thread", that turned out ultimately to be caused by a battery powered device driver shortcoming. That was a months-long 'ordeal'.
I'm gonna point the finger at a bad device. Question is how to find it.
I don't think disabling them in the devices page is good enough. I think you have to de-power it.
Then, after you, say, open a breaker, there's the waiting until it screws up again.
Ughhh.
certainly no rush - and ty for helping! so here's a screenshot from the logs on the dining room art device:
if I go to settings / zwave details and then logs - there are no logs.
yes, all the zwave devices were connected to the C8.
during the cloud migration app - what I understood is that hubitat is actually taking the zwave radio info from the origin device and programming that into the destination device. so that when the destination device (my c8 pro) comes up - all the z-wave devices would re-connect to it automatically. which is what appeared to happen.
That is how I understand a migration as well from what I read. I have never done one.
i can definitely do that - certainly can't hurt and will help eliminate variables.
Yeah, they are only live logs. When traffic happens, a log appears, like with normal logs, but there are no past logs.
You can send some traffic to that device if possible, to get it to show. Then you just have to leave the page up for awhile to see logs accumulate.
Sorry for my delay. Board meeting ran over. They always do. Ugh.
Of course everything looks "normal".
Great idea! Best way to ensure that old hub is not in the mix.
If you have the ability to take a cloud backups; even though things are not perfect, I would suggest you do. Just in case something you do in the troubleshooting process causes things to get even worse and you need to rollback to where you are. A reboot is better than no hub at all at this point.
I have yet to do a migration. I am still using C-8 hubs. I keep hearing the migrations either go extremely well or not without issues like yourself rendering them not stable or acceptable use at all...
If you do have cloud restore capability would you consider restoring the C-8 hub (would be nice if you still had it to roll back to without a restore), wiping the C-8 Pro Hub and re-running the migration again?
Sometimes its worth this type of "radical" approach 
vs. continuing to troubleshooting elusive issues.
Maybe the first migration just didn't get it just quite right.
I've used the restore with 100% success. If you take this approach know the risks and make sure you take at least one backup of the new C8-Pro incase you want to go directly back to that configuration as it is at this point and multiple backups of the C-8 for forward recovery / migration back to the new C8-Pro.
I am sorry I don't have more but I suspect something went wrong with the migration and you could spend weeks (I have with similar types of elusive issues) after I have made many changes only to do a restore and re-apply my changes until I figured out which change I made caused the issue.
I will still continue to see if I can think of anything else.
trying to change one thing at a time - i'm going to wait after shutting down the old c8 hub and see what happens.
the c8 pro has the cloud backup subscription - it's doing one each night.
if the problem comes back, i could certainly take 2 manual backups - one cloud and one local, then go ahead and reset the hub, and then restore the cloud backup and see what happens.
appreciate the help @user837 !
I know it’s a lot of work. Hang in there man.
Make sure your your nightly backups of the pro hub do not eventually overlap all of the C8 hub backups before you get a chance to restore the C8 hub 
Hope you have a great evening
so i didn't have hub protect when i just had the c8. i bought that for a scenario like this - where my primary hub failed, and i'd want to use cloud backup to restore it to the spare unit.
i read that there should be no issue running a cloud restore of backups made on the C8 Pro to the C8.
thanks - you as well!
