Fault-finding
The router keeps restarting on its own
Heat, a failing power adapter, or the router running out of memory under load. In this climate the first two account for most of it — a router in a warm enclosed space with an ageing adapter will reboot under exactly the conditions you notice it, which is when everyone is using it.
Written and reviewed by our networks and fiber bench · Last reviewed
Where the router is sitting
Routers are passively cooled and generate real heat. One in a closed cabinet, on top of another warm device, or in direct afternoon sun will overheat and reset. Moving it somewhere ventilated is free and it resolves a genuine share of these. Vents facing upward and clear space around it is all that is required.
The power adapter, again
Small switching adapters age badly under repeated outages and voltage sags. A failing one delivers enough to run the router at idle and not enough under load, which produces resets exactly when traffic rises. Substituting a known-good adapter of the correct voltage and polarity is the fastest test available.
Memory exhaustion under session load
A cheap router tracking hundreds of concurrent connections can exhaust its memory and reboot to recover. The signature is resets that correlate with busy periods rather than with heat or time. That is a capacity problem, and the fix is a router sized to the real device count rather than a firmware setting.
Firmware, and knowing when to stop
An out-of-date firmware with a known stability bug is worth updating. But if the router is old, cheap and already at its session limit, updating firmware is postponing a decision rather than making one. At that point the honest recommendation is a capable router, and we say so rather than billing for repeated visits.
Why does my router keep rebooting?
How do I tell heat from a power problem?
Heat resets tend to happen after a period of running and cluster in the afternoon; power-adapter resets happen under load regardless of how long it has been on. Touching the case tells you a lot — a router too hot to rest a hand on comfortably is running outside where it wants to be.
Is it worth repairing a router?
Rarely, beyond replacing the power adapter, which is cheap and often the whole fault. Beyond that the components are not economically serviceable and a capable replacement costs less than the labour would. Try the adapter first, because that one substitution resolves a surprising number of apparently dead routers.
Would putting it on a UPS help?
It helps with the resets caused by dips and brief cuts, which in many areas is a real share of them. It does nothing for heat or for memory exhaustion. It is worth doing anyway, because a network that survives an outage is worth more than one that merely restarts reliably afterwards.
Rather have it done?
This is the equipment the whole network depends on: a router that routes, a managed switch that can be diagnosed, and a firewall with rules someone wrote deliberately. A small-office set installed and configured runs PKR 45,000 to 150,000, sized to how many devices you actually run.
Router, switch and firewall setup in Islamabad — prices and scope