Router power cycles randomly

Problem summary

A router that power cycles randomly may have a power, heat, firmware, or hardware problem rather than a Wi-Fi coverage issue.

When to worry

• Router lights go dark and boot back up.
• All devices disconnect at the same time.
• The router or power adapter is hot, buzzing, or unreliable.

Fast checks

• Confirm whether the router uptime resets after each event.
• Check the power adapter is the original rating.
• Move the router out of cabinets or direct heat.
• Plug into a known-good outlet or UPS surge-only outlet for testing.

Likely causes

• Failing or under-rated power adapter.
• Router overheating.
• Bad outlet, loose plug, or UPS overload.
• Firmware crash or aging hardware.

Step-by-step fix

1. 1Watch the lights during a dropout to separate Wi-Fi loss from power loss.
2. 2Use the correct power adapter from the router vendor.
3. 3Improve ventilation and remove dust around vents.
4. 4Update firmware from the router app or admin page.
5. 5If power cycling continues, replace the adapter or router rather than tuning Wi-Fi settings.

What not to do

• Do not keep stacking devices on top of the router.
• Do not use a random adapter with the wrong voltage or polarity.
• Do not chase channel settings if the router is actually rebooting.

When to stop/get help

• Stop if the adapter or router smells, sparks, buzzes, or gets unusually hot.
• Stop before opening the router or power supply.
• Get qualified help for outlet, wiring, or breaker problems.

Related tool/checklist

Use the linked tool when you need a guided plan from your exact symptoms instead of a static checklist.

Related problems

Last reviewed

2026-05-06

Sources/assumptions

• Assumes a consumer router or ISP gateway.
• Electrical safety signs take priority over networking diagnosis.