1
Verify the likely cause
Confirm a single preferred Thread dataset, restart the border router before Home Assistant and recommission only devices with mismatched credentials.
FULL AI ANALYSIS
Matter devices become unavailable after router reboot
Generated Sep 13, 2026, 11:55:04 PM
Analysis 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.
Possible 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%Suggested fixes
2
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.