Symptoms
- One device stops responding while others on the same hub still work
- Device shows as unreachable but is still powered on
- Device that used to work reliably now drops out often
- Device works when moved closer to the hub
Likely causes
- CommonDevice is out of range of the mesh networkZigbee and Z-Wave rely on a mesh of powered devices relaying signal; if nearby repeater devices are missing or off, range shrinks.
- CommonA nearby always-on device (like a smart plug or bulb) that acted as a repeater was unplugged or removedRemoving a mains-powered device can break the mesh path to more distant battery devices.
- PossibleDevice needs to be re-paired after a hub reset or firmware updateSome updates or hub changes can drop existing device pairings.
- PossibleInterference from Wi-Fi routers or other 2.4GHz devicesZigbee shares the 2.4GHz band with Wi-Fi and can suffer interference in crowded environments.
- Less commonBattery-powered device's battery is low, weakening its signalA weakening battery can reduce a device's transmit range before it fully dies.
What to do
- Check whether any mains-powered smart plugs or bulbs near the affected device were recently unplugged or removed.
- Move the device or add a mains-powered repeater device between it and the hub.
- Replace the battery in the affected device if it's battery-powered.
- Remove and re-pair the device with the hub through the app.
- Change your Wi-Fi router's channel to reduce overlap with the Zigbee network, if your hub's app shows current channel usage.
- Restart the hub itself, since a hub-side glitch can affect specific device connections.
- Check the hub's device map (if available) to visualize mesh connections and identify weak links.
When to call a pro
No professional needed; a smart home installer can help design a stronger mesh layout in a larger home.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.