r/SmartThings • u/somevietkid • 1d ago

Zigbee devices offline

Hey all, my Zigbee devices have been intermittently going online and offline over the past few weeks, presumably because of the update. I did a power cycle of my hub and then each separate device and that seems to have mixed results. At times, all of them will go online again and some, or none, of them will. I’ve also tried removing the device and pairing it with my hub again with mixed results. Most of my Zigbee devices are SmartThings motion sensors and multipurpose door/window sensors as well as ThirdReality multipurpose door/window sensors. The SmartThings sensors seem to be doing better now, but I’m having difficulty with the ThirdReality sensors. Any ideas on what to do here? I haven’t looked into changing the Zigbee channel on my hub yet since I’m not too sure on what that exactly entails. Any guidance would be really appreciated!

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u/SmartThingsPower1701 Enthusiast 1d ago

Did you leave your hub off for at least 20 minutes? Zigbee devices go into panic mode after that and are ready to join again after the hub comes back online. I just had a similar issue with my Z-Wave devices, left my hub unplugged for an hour, turned it back on and my devices all came back online. The Zigbee radio channel can be changed in the advanced tab on the web interface. I run mine on channel 25 to try and keep it up and away from Wi-Fi channel 11 at the top of the Wi-Fi range since Zigbee and Wi-Fi both run in the 2.4GHz band.

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u/Brown_Wei 16h ago

Before re-pairing more devices, I’d try to separate a coordinator/network problem from a device-specific problem.

Since the SmartThings sensors seem to recover better than the ThirdReality sensors, I’d compare:

  • whether the offline devices are concentrated in one area;
  • their battery level and last-seen time;
  • whether mains-powered Zigbee routers stay online;
  • the hub firmware and current Zigbee channel.

I’d change one variable at a time and test a single ThirdReality sensor for a day, rather than re-pairing the whole network. Does waking the sensor manually make it come back online, or does it remain unavailable until the hub is restarted?