I was having the same situation, unresponsive and unavailable z-wave devices,
I have two hubs-two locations, all my devices migrated in one location but this is another story.
I erased everything, devices (120), hubs, locations, hard reset all, now after almost one week every single device works fine. Hope this lasts… maybe just till next firmware update.
@JDRoberts said in one of his posts to don’t add more than 25 devices one time, add z-wave devices and wait 48 hours. Me, I added almost 35 and I stopped, I saw the post later.
Here is part of the email from support …
Here is the answer to your inquiry.
You should be able to select any of the test locations and click the gear icon and then remove from there. If you have some zwave devices that are showing unavailable you should try to preform a zwave network repair to see if they pull them back onto your network. If that does not work, you can try to zwave exclude and readd your zwave devices. You will have to zwave exclude them first so that your devices are removed from the network. You can zwave exclude your device by selecting the menu or more option, selecting your hub, scrolling down to zwave utilities, and selecting general device exclusion. Once you selected remove you use the manufacturers instructions to put device into pairing mode. After the device shows removed you will be able to readd it by going to my home, things, add a thing, and then while the application searches follow the same steps to put device into pairing mode so that the application is able to recognize it. If you are still experiencing issues, please give us a call at 866-813-2404.