Wi-Fi troubleshooting: a practical guide

Before changing settings, get a baseline. Run our Network Test to check your download speed, latency and jitter. Write the numbers down, then compare after each fix below so you know what actually helped.

1. Restart your router and modem: unplug both for 30 seconds, plug the modem in first, wait a minute, then the router.
2. Restart the device having trouble, half of persistent Wi-Fi issues are a stuck network stack on the device, not the network.
3. Check if other devices on the same network have the same problem. If only one device struggles, the fault is local to it.
4. Move closer to the router temporarily to rule out distance and interference.
5. Check your ISP's status page or app for a known outage in your area.

This means your device has a link to the router, but the router either has no internet or isn't passing it through.

1. Check if other devices on the same Wi-Fi can browse. If none can, the problem is the router or the ISP connection, not your device.
2. Look at the modem's lights, a solid "internet" or "online" light should be lit; blinking or off usually means no signal from the ISP.
3. Try connecting a computer directly to the modem with an Ethernet cable, bypassing the router entirely, to isolate whether the router is the problem.
4. On Windows, run Settings > Network & internet > Status > Network troubleshooter.
5. On macOS, hold Option and click the Wi-Fi icon in the menu bar to see detailed diagnostics, or open Wireless Diagnostics from Spotlight.

Suspect actual hardware failure when:

• The router's lights show a hardware error pattern (check the manual for what a red or repeatedly-blinking light means on your specific model).
• A factory reset and firmware update don't change anything, and the problem persists across every connected device.
• The router is more than 4-5 years old and struggles even with few devices connected, aging hardware simply can't handle modern traffic loads and Wi-Fi standards.
• One specific device fails to get a good signal everywhere in the house while others are fine there, that device's Wi-Fi antenna or adapter may be the actual fault, not the network.

If you've isolated the problem to your ISP connection rather than your own equipment, contact them directly, no amount of router troubleshooting fixes a fault on their end of the line.

Slow Wi-Fi is really three distinct faults with three different fixes, and treating them as one problem is why so much troubleshooting goes nowhere. The first is low bandwidth, where pages load but large downloads crawl. The second is high latency, where bandwidth looks fine but everything feels sluggish and video calls stutter. The third is instability, where speed is fine most of the time but the connection drops repeatedly.

Measure before you change anything. Run a speed test next to the router and again where you actually use the device. A big gap between the two means a coverage problem inside your home, which no amount of contacting your provider will fix. Similar numbers in both places mean the incoming connection itself is the limit, and that is a conversation with your provider rather than a router setting.

Wi-Fi is radio, and radio is defeated by physics long before it is defeated by hardware. A router in a cupboard, behind a television, on the floor, or in a corner of the house is working against every law of signal propagation. Moving the same router to a central, elevated, open position frequently doubles usable coverage without spending anything.

• Concrete, brick and anything containing metal or water absorb signal heavily, including mirrors, radiators, fish tanks and foil-backed insulation.
• Every floor between the router and the device costs roughly as much signal as a thick wall.
• Microwave ovens, cordless phones and older baby monitors interfere directly with the 2.4GHz band.
• Keep the router at least a metre from other electronics and never inside a metal enclosure.
• If coverage still fails at the far end of the house, a mesh system beats a repeater, because repeaters halve throughput on the band they retransmit.

Most routers broadcast on both 2.4GHz and 5GHz, and newer ones add 6GHz. They behave very differently. 2.4GHz travels further and passes through walls better but carries less data and is heavily congested in flats and terraced housing. 5GHz is much faster with far less interference but loses strength quickly through solid walls.

• Use 5GHz for laptops, phones and streaming devices in the same or an adjacent room as the router.
• Use 2.4GHz for smart home devices, garden cameras and anything at the far edge of coverage.
• If both bands share one name, a device may cling to the weaker one, temporarily splitting the names helps diagnose it.
• On 2.4GHz choose channel 1, 6 or 11, they are the only three that do not overlap each other.

When a connection degrades gradually over days, the cause is usually accumulated state in the router rather than anything you did. A structured restart clears it properly, and the order matters.

1. Power off the modem and the router, and unplug both at the wall.
2. Wait a full sixty seconds so capacitors discharge and the provider releases the session.
3. Power the modem on first and wait for its lights to settle completely.
4. Power the router on and wait a further two minutes before testing.
5. Run a speed test from the same spot each time so you have comparable numbers over weeks.

Keep a short log of results with dates. If your provider disputes a performance problem, a series of timestamped measurements from the same location is far more persuasive than a description, and it also reveals patterns such as slowdowns only during evening peak hours, which point to network congestion rather than anything in your home.

Intermittent network problems are difficult to fix precisely because they are gone by the time anyone looks. A short written record turns a vague complaint into evidence, and it often reveals the cause on its own once a pattern appears.

• Test from the same two places each time, next to the router and where the problem occurs.
• Record download speed, upload speed, latency, the time of day and which band you were connected to.
• Note anything unusual, a new appliance, a neighbour's new router, a firmware update or a house full of guests.
• Test both wired and wireless where possible, the difference separates your home network from the incoming line.
• Keep at least a week of readings before drawing conclusions, single measurements mislead constantly.

With that record, decisions become straightforward. Consistent shortfalls on a wired connection belong to your provider, wireless-only shortfalls belong to placement and interference, and problems confined to particular hours point to congestion that no equipment change will remove.

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