Hub forgets devices after a power cut

After an outage the hub comes back but several devices show offline or missing.

Applies to

Zigbee and Matter hubs
Smart home bridges
Cameras acting as hubs

Last verified2026-10-14

Quick answerTroubleshooting · last verified 2026-10-14

After an outage the hub comes back but several devices show offline or missing. Most common cause to check first: Hub rebooted faster than the devices re-joined the mesh

Applies toZigbee and Matter hubs, Smart home bridges, Cameras acting as hubs

CategorySmart Home Hubs

Escalate whenIf devices disappear after every outage, protect the hub with a small UPS or check the hub power supply rather than re-adding devices each time.

Last verified2026-10-14

How to cite this page

IoT Atlas. "Hub forgets devices after a power cut". https://hi-spark.net/troubleshooting/hub-loses-devices-after-power-cut.html Last verified 2026-10-14.

Likely causes

Hub rebooted faster than the devices re-joined the mesh
Devices with weak batteries failed to rejoin
Network name or IP change after the outage
Corrupted local database after an unclean shutdown
Router took longer than the hub to come online

Quick checks

Wait ten minutes and refresh the app before reacting
Check whether the hub is online in the app
Confirm the router and internet came back first
Look for devices that also lost battery level readings

Step-by-step fix

Reboot the router first, then the hub

Wait for the mesh to re-form and refresh the app

Re-add only the devices that stay offline

Update hub firmware

Add a small UPS for the hub and router to avoid unclean shutdowns

Frequently asked questions

Why does this happen: Hub forgets devices after a power cut?

After an outage the hub comes back but several devices show offline or missing.

What is the most likely cause?

Hub rebooted faster than the devices re-joined the mesh; Devices with weak batteries failed to rejoin; Network name or IP change after the outage.

What should I check first?

Wait ten minutes and refresh the app before reacting; Check whether the hub is online in the app; Confirm the router and internet came back first; Look for devices that also lost battery level readings.

How is it fixed?

Reboot the router first, then the hub; Wait for the mesh to re-form and refresh the app; Re-add only the devices that stay offline; Update hub firmware; Add a small UPS for the hub and router to avoid unclean shutdowns

When should the case be escalated?

If devices disappear after every outage, protect the hub with a small UPS or check the hub power supply rather than re-adding devices each time.