I have a SmartThings Hub v3 with various Leviton Z-wave switches, dimmers and outlets as well as a Aeotec Multisensor 6, 2 Ecobee thermostats, 2 Ecobee sensors and a Harmony Hub.
I was running on this hub and its initial setup since 2018-2019 approx. It was working well, but with a few hickups now and then. Mainly, some devices would start to show as offline. Sometimes, I could still control them with the SmartThings app, sometimes not at all.
I decided to do a clean install (a new SSID), remove every device from the SmartThings app and add them all over again. It’s been about a month since the clean install. At first, everything was all right. But, now again, some devices start to show offline in the app. For now, it is 6 devices:
1 Ecobee thermostat (I do not mind if it is offline)
2 Ecobee sensors (I do not mind if they are offline)
3 Leviton Z-Wave switches
Funny things is I can still partially control some of the Leviton switches even if showing offline. i.e., I can turn the lights on, but then cannot turn them back off. 2 of those switches are 3-way switches (1 dimmer, 1 regular), the other one is a one-way dimmer switch. When I do manually control the “offline” device within the app, the device then doesn’t show as offline anymore, but still, I can’t close the lights after having opened them. After a while the devices reappear as offline in the app. However, when a scene or a routine is triggered, these devices work fine (either lights going on or off) even if they appear as offline.
I have other Leviton Z-wave switches (3-way or one-way; dimmer or regular) in the app and, as of now, they work fine. Some of those are farther away then the malfunctionning ones and stil work fine. One thing I see the 3 problematic switches have in common is that they all have one unit in the same electrical box (it’s a 4 units electrical box). One of the 3-way switches have its master unit in that electrical box, but the other 3-way switch only has its slave unit in that electrical bow. The one-way switch is also in that electrical box. All units are well wired by my electrician. They were working great at the beginning of the new install.
What could be wrong? What should I check about those devices? What can I do to solve that issue and, more importantly, make sure it doesn’t happen again (repair the devices could work temporary, but, as seen with the clean install, doesn’t stay in proper working mode)?
Thank a lot in advance for your help about all this!