Repeated router reboots can follow unstable power, overheating, firmware crashes or a failing adapter. Confirm that the unit actually reboots rather than only losing internet sync. Try the original adapter directly in a known-good wall outlet, not on a strip or timer.
Differential
Likely causes of “Router keeps restarting by itself”, and how to tell them apart
- 1
The power adapter or outlet is unstable
What separates it Every light goes out at once, the router boots as if newly plugged in, and it happens more when other appliances start.
How to confirm Try the original adapter directly in a known-good wall outlet, not on a strip or timer.
- 2
The router is overheating
What separates it The unit is hot to the touch, sits on carpet or in a cabinet, and restarts more in warm weather or under heavy traffic.
How to confirm Move it into open air and check whether the reboots become less frequent.
- 3
A firmware crash is rebooting the router
What separates it The router restarts at random or under specific traffic, and the uptime counter in the admin page resets.
How to confirm Check the admin page for uptime and any log entries about a crash, and note the firmware version.
- 4
A failing adapter or a bad USB or Ethernet device is causing a reset
What separates it Reboots began after a device was plugged into a USB port or a cable was replaced.
How to confirm Unplug nonessential USB devices and disconnect one Ethernet device at a time to test.
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether all lights go out, whether the uptime counter resets and whether Wi-Fi disappears.
- The router's temperature by touch, where it stands and what shares its power outlet.
- The firmware version and the date of the last update.
Try in this order
0 of 4 completedCapture the exact symptom
ReversibleWatch whether all lights extinguish, uptime resets and Wi-Fi disappears, and note temperature and power source.
Run the smallest isolation test
ReversibleUse the original adapter directly in a known-good outlet, improve ventilation and disconnect nonessential USB devices.
Correct only the proven cause
ReversibleInstall stable official firmware after backing up settings; replace the adapter/router if reboots continue in minimal configuration.
Verify before changing anything else
ReversibleMonitor uptime for 24 hours under normal traffic.
Stop boundary
When this stops being a self-service repair
- !Replace the adapter or router if reboots continue in a cool room on a known-good outlet with current firmware.
- !Do not open the router or use an adapter that is not the maker's specified voltage and current.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Is a router that restarts once a day a problem?+
A scheduled restart is a setting some routers offer. Random restarts, especially with the uptime counter resetting, point at power, heat or firmware.
Why does the router restart itself?+
Overheating, a failing power supply or firmware faults are common causes.