# Wi-Fi drops and Bluetooth disconnects: driver, power and interference

> Diagnose Windows 11 Wi-Fi/Bluetooth instability by adapter driver, power management, band/channel, USB 3 interference and router settings — without disabling security.

**Tested on**

- Build: 26300.9457
- Edition: Pro (26H2)
- Architecture: x64
- Evidence: E1
- Verified: 2026-10-28

## The short answer

Wi-Fi and Bluetooth share the 2.4GHz band and often the same combo chip. Separate the problem:

- **Only one device** drops → device/driver.
- **All Wi-Fi drops when Bluetooth audio starts** → coexistence/interference.
- **Only at distance** → signal/channel.
- **Only after sleep** → power management/driver.
- **Only on 2.4GHz** → congestion/USB 3 interference.

Do not start by disabling the firewall or WPA3.

## Gather evidence

```powershell
netsh wlan show interfaces
netsh wlan show drivers
Get-NetAdapter -Physical | Select-Object Name, InterfaceDescription, Status, LinkSpeed
```

Look for:

- signal quality and channel;
- driver version/date;
- roaming/association events in Event Viewer;
- WLAN AutoConfig service state.

## Wi-Fi checklist

| Check | Action |
|---|---|
| Driver | Update from OEM, not a random pack; roll back if it started after an update |
| Power management | Device Manager → adapter → Power Management → uncheck “allow computer to turn off” for testing |
| Band | Prefer 5/6GHz if close; 2.4GHz for range |
| Channel | Use 1/6/11 on 2.4GHz; avoid congested channels |
| USB 3 | Move USB 3 devices/hubs away from the antenna; USB 3 radiates near 2.4GHz |
| Router | Update firmware; disable “smart connect” temporarily to separate bands |
| VPN | Test with VPN off; some clients break roaming |

## Bluetooth checklist

- Remove and re-pair the device.
- Update the Bluetooth adapter driver and device firmware.
- Test with the device 1m from the PC.
- Disable “Allow the computer to turn off this device” for the Bluetooth adapter **for testing**.
- Check for 2.4GHz congestion; move the receiver/dock.
- On a laptop, the antenna may be shared; a bad Wi-Fi card can affect BT.

## When it is the router

If every device drops on the same SSID, the PC is not the problem. Check router logs, channel utilization, firmware and ISP. A “Wi-Fi 7” router with a bad backhaul is still a bad router.

> **Caution: Do not disable WPA3 or the firewall to “stabilise” Wi-Fi**
>
> If a device only works with old security, replace the device or isolate it on a guest network. Downgrading the whole network is not a fix.

## Sources

- [Microsoft — Network adapter troubleshooting](https://learn.microsoft.com/en-us/windows/win32/nativewifi/portal)
- [Microsoft — Bluetooth troubleshooting](https://learn.microsoft.com/en-us/windows/win32/bluetooth/bluetooth-start-page)

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Source: https://winbook.fyi/en/windows/fixes/wifi-bluetooth/