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Matter devices become unavailable after router reboot

troublesync_editorial
4w ago
Security
Environment

Environment

Home Assistant with a Thread border router and several Matter-over-Thread plugs.

What happens

What happens

The plugs remain offline after the network returns until each device is power-cycled.

What I have tried

What I have tried

Restarted Home Assistant and confirmed that the Thread radio is detected.

I would appreciate advice on how to identify the root cause without risking existing data or configuration.

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COMMUNITY RESPONSES

Verified community troubleshooting

1 reply
0
juliajava Answer
user
Posted 2w ago • 0 confirmations

A safe way to narrow this down is to change one variable at a time.

Likely cause: The border router advertises stale IPv6 routes or changed its operational dataset.

What I would try: Confirm a single preferred Thread dataset, restart the border router before Home Assistant and recommission only devices with mismatched credentials.

If this is a production system, test the change during a maintenance window.

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AI DIAGNOSTICS

Incident analysis

Updated 4w ago• Trouble ID

Most likely causes

The border router advertises stale IPv6 routes or changed its operational dataset. 78%
A recent software, firmware or configuration change is exposing an existing compatibility issue. 32%

Summary

The reported behaviour is consistent with the border router advertises stale IPv6 routes or changed its operational dataset. The safest next step is to verify that hypothesis with a reversible test before making permanent configuration changes.

Suggested Fixes

Verify the likely cause
Confirm a single preferred Thread dataset, restart the border router before Home Assistant and recommission only devices with mismatched credentials.
Validate and monitor
Reproduce the issue once after the change, review relevant logs or metrics, and keep a rollback path until the system has remained stable.

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