Symptoms
- All lights on the router go dark then come back on their own
- Wi-Fi and wired devices lose connection at the same time briefly
- Router's uptime resets shown in its admin page are very short
- Reboots happen at random times, not tied to usage
Likely causes
- CommonFaulty or loose power adapterA worn power brick or loose cable connection can cause momentary power loss that reboots the router.
- CommonOverheatingRouters can shut down and restart as a protective measure when they get too hot.
- PossibleFirmware bug or pending updateSome routers auto-reboot to apply scheduled updates.
- PossiblePower strip or outlet issueA failing outlet or power strip can cause intermittent power drops.
- Less commonAging internal hardwareCapacitors or other components can degrade over years of continuous operation.
What to do
- Check that the power adapter is firmly plugged into both the router and the outlet, and that the cable isn't frayed or loose.
- Plug the router directly into a wall outlet instead of a power strip to rule out a strip issue.
- Feel the router's temperature and relocate it away from direct sunlight, heat sources, or enclosed cabinets.
- Check the admin page for a scheduled reboot or auto-update setting and disable it if reboots are unwanted.
- Update the firmware manually to the latest stable version.
- If you have a spare power adapter with matching voltage, try swapping it to rule out a failing adapter.
- If random reboots continue after a firmware update and a cool, ventilated location, the router hardware itself may be failing.
Tools and parts
- Multimeter (optional, to test outlet)
Replacement power adapterSearch: “router power adapter replacement”
Replacement routerSearch: “home wifi router”
When to call a pro
If the router still restarts randomly after ruling out power and heat, it's likely failing and worth replacing rather than repairing.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.