Leviton DZ15S reporting unavailable

I’m having a weird problem with a new Leviton DZ15S light switch that I just installed.

The switch operates normally as a manual switch. That part is good. But it’s not communicating properly with Smartthings. When I first installed it a week and half ago, everything seemed fine. But a few days ago, I noticed the weird behavior.

First, it seems to timeout. After some amount of time (that I haven’t figured out), Smartthings starts reporting that it is unavailable. I lose all ability to control it from Smartthings. If I tap the paddle, it will reconnect, sort of.

When the light it off, the app will report that it is off. I can then turn it on from the app. However, the status does not update, and I can’t turn it off from the app. Also, when I turn it on manually, the status does not update.

Any ideas why the switch is only sort-of interacting with Smartthings?

Have you run z-wave repair? Do you have a good z-wave signal to that device?

I tried running the repair utility, but it doesn’t seem to have done anything to help. Range and location are definitely good. There’s a door lock and a few Linear switches a few feet from this switch that work perfectly.

No other thoughts? Nobody else seen this issue?

I’m having this same problem. I installed 8 of these Leviton DZ15S switches. Two of the switches work good. Five of them will become “Unavailable” in the app after a period of time. If I manually use the switches, they will become usable in the app again. And one of the switches will periodically become lost (no longer listed in the ST app). Anyone know how to solve the problem with switches becoming “Unavaialble”??

I tried manually activating all the switches so that the “Unavailable” status was no longer there in the app by all the switches. Then I selected Repair z-wave Network from the app, which succeeded. After a period of time, the five switches became “Unavailable” again.

I also tried moving ST hub farther away from wifi router, but this did not appear to help. I read somewhere that wifi routers can overwhelm z-wave devices.

If I turn off “Device Health” in the app, then all the “Unavailable” messages go away and I appear to be able to control all the switches just fine. Looks like the device health feature is not working properly.

I have had 4 DZ15S switches in my network for about 1.5 yrs now and I would like to get an answer on this question.
These switches will go unavailable from time to time but there are usually 1-2 switches that are UNAVAILABLE at any given time. I can control them ALWAYS using the classic smartthings app scene, BUT cannot control the unavailable switches via webcore. The switches are only 25 feet from the hub.
SO, can someone explain why the smartthings app scenes can ALWAYS control them but not webcore? Obviously, smartthings has no problem sending a code and the switches have no problem receiving those codes. So why would webcore command be any different? Can someone please explain.

I had similar issue with three Leviton devices, a DZ15S and two DZ6HD dimmers. Periodically, the ST app would show them stuck in some state and couldn’t control them. Alexa would work nearly always.

Solution was to update the firmware on the devices.

I did it the expensive way, by buying a Z-wave stick and copy of the Homeseer Z-flash utility. Smarter folks have opened a case with Leviton support and gotten a loaner Z-wave stick plus software for free.