First checks
- Check the event log and note whether the restart occurs under load or at a set time.
- Test the correct power adapter directly in a reliable outlet.
- Improve ventilation and disconnect optional USB devices.
How to interpret the result
A restart at the same scheduled time suggests a configuration or maintenance feature. Restarts during heavy traffic may indicate heat, power or firmware instability. If the router stays online but the WAN reconnects, the issue may be the upstream service rather than a full reboot.
What this symptom usually does not prove
Do not replace firmware or factory-reset until power and heat have been checked and the current configuration has been recorded.
Escalate with useful evidence
Record which devices are affected, whether Ethernet and Wi‑Fi behave differently, the router or gateway status, and the exact time of the fault. This evidence helps distinguish a local client issue, radio problem, routing policy, upstream service fault or failing hardware.
Before a factory reset
Restart the relevant device first and save any ISP, Wi‑Fi, reservation, port-forwarding or mesh information needed to rebuild the network. A factory reset is a configuration-recovery action, not a universal diagnostic test.