An update from SmartThings support with my emphasis added. I especially like the bolded portion… rest assured i have responded with this thrread to make sure they understand what a “non trending issue” looks like.
Nov 14, 4:27 PM MST
Thanks for reaching out, sorry for the trouble.
The firmware update should not have caused a z-wave network disruption. In most cases during the download/install of the firmware the hub may have rebooted and devices that were already in a bad state could have fell off. Usually, when devices fall offline the biggest culprits are distance, interference or a low/dead battery (in battery powered devices of course). A z-wave network repair is more of a diagnostic tool that shows you where a device, path or node is failing to repeat or carry the signal (in rare cases it may bring a device back online). If a device shows up as failed for example, it most likely will need to be excluded and re-paired back to the hub.
The hub firmware update shouldn’t have caused these issues but when other outliers have been eliminated we can see why the assumption would be the firmware update as a root cause. Other users with the same set up and larger have not reported the same behavior (at least not to us) and thus on our end it’s not a trending issue. The WiFi devices will not cause interference on the z-wave frequency as they communicate on a different band/wavelength. They really only affect zigbee devices but you would need a LOT of interference for that to be a real cause (heavy duty router, hub on top of router, that type of thing).
We checked out the account and it does look like most of your z-wave devices are offline, except for the Front Porch Light. Now, given the status of the z-wave network either that device is close to the hub or is just in an area where the z-wave signal is able to reach it reliably which is why it hasn’t fallen off just yet. If that is not the case, then it’s surprising as the hub has no other devices to bounce through at the moment (since they’re all offline). The hub can reach about 25-30 feet not including building materials known to cause interference such as walls, bricks, concrete, steel, etc. After and within this range we recommend repeating devices to help carry the signal. Repeating devices are devices that have constant current running to them (in wall switches, in wall outlets, plug in outlets, etc).
It looks like you have enough however imagine a tent being held up by your repeating devices (the tent is the mesh network and the repeaters are the poles, sorry for the comparison but it helps sometimes). If one or more of the repeaters fall, then the signal suffers and thus the network suffers. The mesh will collapse if most/all of the nodes/devices fall offline. Usually at this juncture the only real alternative would be to tear down the z-wave network and start once again. Excluding and re-including devices starting with the ones closest to hub and moving outward. This will simulate a web almost (like a spider web) and allow the greatest chance for a stable and reliable network.
We know it’s not ideal, especially as tedious as excluding devices and re-adding them is but it’s really the only way to correct the issue at hand. We cannot revert a firmware update as it’s automatic and any replacement hub will carry the latest firmware (which is the current one on your hub). Now, if you do tear down the network and set it up once again and the issue continues, then it may be a hub issue. If that’s the case we can definitely replace it for you to rule out a bad z-wave module.
If you are a bit hesitant to jump in and start from scratch with your z-wave devices, you can try what’s known as a “firmware flash”. Simply hold down the recessed button on the back of the hub until you see the LED on the front strobe/blink yellow, then let go. This will cause the hub to download the firmware once again and refresh the modules. In some cases this brings back some devices and helps. If not, then you know the only option is to tear down and re-build.
Give that a shot and let us know how it goes!