Why Does My Router Keep Restarting by Itself, and How Do I Stop It?

Your internet drops for a minute, and when you look, the router’s lights are going through their startup sequence again. A router that restarts on its own is not always broken — sometimes it is doing exactly what a setting tells it to. The trick is to look at when it happens: a restart at the same time every night has a different cause than one every time someone starts a download. This guide covers the causes in order from the most harmless.

Look at When It Restarts

Before changing anything, note a few restarts. Look at the router’s system log — on the admin page, usually 192.168.1.1 or 192.168.0.1, under System Log, Event Log or Administration. After a reboot the log starts again from the boot messages, so the time of the first entry tells you when it restarted.

The pattern points to the cause:

• Same time every day or week — a reboot schedule or automatic firmware update.
• When many devices are busy, or in the afternoon heat — overload or overheating.
• Randomly, sometimes several times an hour — power supply, a failing router, or a bad firmware version.
• Only when something else switches on — a power problem on that outlet or circuit.

Also check that it is really the router restarting and not the internet dropping. If the router’s lights stay steady while only the internet light goes out, the problem is the modem or the line — see internet keeps dropping.

Scheduled Reboots and Auto-Updates

Many routers can reboot themselves on a schedule, and some have it turned on by default or by the provider. ASUS lists this first in its troubleshooting for routers that restart regularly: check whether the Reboot Scheduler is enabled and turn it off. Other brands call it Scheduled Reboot, Auto Reboot or Reboot Schedule, usually under System, Administration or Maintenance.

Automatic firmware updates also restart the router, often at night. ASUS’s second step is to turn off automatic firmware upgrade if the restarts bother you (Administration → Firmware Upgrade). If you do that, remember to check for updates by hand — see how to update router firmware.

A nightly scheduled reboot is not harmful by itself; some people keep it on purpose. See how often should you reboot your router.

Power Problems

Unstable power is one of the most common causes of random restarts. ASUS recommends:

• Try another outlet, not a power strip shared with heaters, printers or other heavy loads.
• Make sure the adapter plug is fully seated in the router and the outlet; a loose barrel plug can cut power for a split second.
• Check the adapter cable for damage.

Use only the router’s original power adapter or an exact replacement with the same voltage, current rating and polarity — a weaker adapter can work at idle and fail when the router is busy. If restarts line up with short flickers of the lights in the house, a small UPS keeps the router running through them; see router not working after a power outage.

Overheating and Overload

Routers get warm in normal use, but one that is boxed into a cabinet, stacked on a modem, standing in the sun or covered with dust can overheat and restart to protect itself. Give it space on all sides, keep vents clear and stand it the way the manufacturer intends. If it is hot to the touch and restarts more on warm days, heat is the likely cause.

Heavy load can also crash an older or weaker router: dozens of connected devices, many simultaneous downloads, torrents or a VPN running on the router push its processor and memory to the limit. If restarts come at busy times, see whether one device or app is responsible — who is connected to my Wi-Fi shows how to check. For electricity use and heat, see how much electricity does a router use.

Firmware and Reset

A buggy firmware version can make a router crash and reboot. ASUS advises keeping the firmware up to date; if restarts began right after an update, check the manufacturer’s site for a newer version.

If nothing above explains it, reset the router:

1. Standard reset: with the router on, hold the Reset button for 5–10 seconds until the power light starts flashing, as ASUS describes.
2. Set it up again from scratch rather than restoring a saved configuration — a corrupted setting can carry over in a backup file. See how to factory reset a router and how to set up a new router.

ASUS also documents a deeper hard factory reset for cases where the standard one does not help; the method depends on the model.

When the Router Is Failing

If the router still restarts after a reset, on a different outlet, with the original adapter and good ventilation, the hardware or its power adapter is likely failing — ASUS’s own conclusion is to contact customer service at this point. Try a replacement adapter if you can get one; it is cheaper than a new router and adapters fail more often.

If the router belongs to your provider, ask them for a replacement. If it is yours and several years old, it may be time for a new one — see how often should I replace my router.