The short answer
Turn off the adapter’s power saving first, since Windows suspends the Wi-Fi radio to save battery and that alone causes most single-laptop dropouts. Then update the adapter driver from the manufacturer, forget and rejoin the network, and check whether it is clinging to a weak 5GHz signal.
If your phone, TV and tablet are all stable and one laptop drops every few minutes, the router is not your problem. Something on that laptop is either turning the radio off, mismanaging the connection, or choosing badly between bands. All three are fixable in a few minutes.
Fix 1: stop Windows turning the radio off
Open Device Manager
Right-click the Start button, choose Device Manager, and expand Network adapters.
Open the Wi-Fi adapter's properties
Find the one with Wireless, Wi-Fi or AX in its name.
Untick the power saving option
On the Power Management tab, untick Allow the computer to turn off this device to save power. This is the single most effective change on a laptop that drops when idle.
Set maximum wireless performance in the power plan
Power options, change plan settings, advanced settings, Wireless Adapter Settings, Power Saving Mode, set to Maximum Performance on both battery and mains.
Check for a manufacturer power tool
Lenovo, Dell, HP and ASUS all ship utilities with their own power profiles that can override Windows. Look for a wireless or battery saver setting in there too.
Fix 2: the driver
Wi-Fi adapter drivers are one of the few driver categories where the manufacturer’s version genuinely matters. Windows Update supplies a generic version that is often older and occasionally problematic.
Go to your laptop maker’s support page, enter the model, and install the current wireless driver. If the problem started after an update, roll back to the previous version in Device Manager, which is a two-click operation, and see whether stability returns.
Intel and Qualcomm also publish drivers directly, and those are usually newer than the laptop manufacturer’s. Try the laptop manufacturer’s version first, since it is tested against your specific hardware.
Fix 3: the network profile
Forget the network and rejoin it. A saved profile carrying old security settings or a stale key produces intermittent authentication failures that look like signal problems.
While you are there, check the priority order if you have multiple networks saved. A laptop that can see both your main network and an old extender network will sometimes switch between them, which reads as a dropout.
Fix 4: band and roaming behaviour
5GHz is faster and shorter-ranged. A laptop sitting at the edge of 5GHz coverage will hold on to it far longer than it should, because the decision to switch belongs to the client, not the router. The symptom is a connection that is fine at the desk and drops on the sofa, recovering only when you toggle Wi-Fi.
Two settings help, both in the adapter’s advanced properties in Device Manager:
- Roaming Aggressiveness or Roaming Sensitivity. Raising it makes the adapter switch away from a weak access point sooner. Useful in a house with a mesh system or an extender.
- Preferred Band. Setting this to prefer 2.4GHz is a valid fix for a laptop used mostly at the far end of the house, trading speed for stability.
Other advanced settings worth checking: disable 802.11 power save, and if the adapter has a Throughput Booster or similar vendor option, try it both ways.
Run netsh wlan show interfaces in a command prompt while connected. It reports the signal as a percentage, the band, the channel and the negotiated speed. Watching that while walking around the house tells you in a minute whether you have a signal problem or a software one.
Fix 5: interference and physical causes
- A USB 3 device or hub plugged into the laptop is a genuine and well-documented source of 2.4GHz interference. If the drops correlate with an external drive being connected, that is the cause. A shielded cable or moving the device further from the antenna helps.
- The antennas run through the screen bezel on most laptops. A metal laptop stand, a closed lid with the machine in a dock, or a thick case can all attenuate the signal.
- Bluetooth accessories share the same radio on many adapters. A mouse and headphones both connected can degrade Wi-Fi on 2.4GHz.
Fix 6: reset the network stack
If nothing above works, reset the networking components. In an administrator command prompt, run netsh winsock reset and netsh int ip reset, then restart. On Windows, there is also a Network reset option in Settings which does this plus reinstalls the adapters. It clears saved networks, so have your Wi-Fi password to hand.
VPN clients are a frequent complication here. A VPN that has been installed and removed often leaves behind virtual adapters and filter drivers that interfere with normal connections. If you have cycled through VPN software, a network reset is more likely than usual to be the fix.
Why does my laptop drop Wi-Fi when idle but not when I am using it?
Because power management is suspending the wireless radio when there is no activity. Untick the power saving option in the adapter’s properties and set the power plan to maximum wireless performance.
Should I use 2.4GHz or 5GHz on a laptop?
5GHz near the router for speed, 2.4GHz at a distance for stability. If the laptop mostly lives far from the router, forcing 2.4GHz in the adapter settings is a reasonable trade.
Can a USB drive really interfere with Wi-Fi?
Yes. USB 3 devices emit noise in the 2.4GHz range, and poorly shielded cables and enclosures are a known cause of dropouts on laptops. Test by disconnecting them.
Is a USB Wi-Fi adapter a good fix?
It is a valid workaround if the internal adapter is faulty, and a good one can outperform a weak built-in card. It is not a substitute for fixing power management or driver problems, which are far more common.
Why did this start after a Windows update?
Updates replace drivers and can reset power management settings to default. Check both, since the power saving tick box being re-enabled is a very common cause of a sudden return of this problem.
The order that works
Untick adapter power saving and set maximum wireless performance. Install the manufacturer’s driver, or roll back if this started after an update. Forget and rejoin the network. Adjust roaming aggressiveness or force a band if drops track your position in the house. Disconnect USB 3 devices as a test. Reset the network stack last.
