ASUS ExpertBook B9 WiFi Intel AX211 Keeps Dropping Windows 11

The ASUS ExpertBook B9 WiFi keeps dropping with the Intel AX211 adapter on Windows 11 because of driver power management bugs, a router compatibility issue with the 6GHz band, or aggressive Windows WiFi power saving settings. I fixed persistent WiFi drops on an ExpertBook B9450FA by updating the Intel AX211 driver from ASUS support and disabling WiFi adapter power management in Device Manager.

Why ASUS ExpertBook B9 WiFi Keeps Dropping

Intel AX211 Driver Power Management Bug

The Intel AX211 has a known power management issue in certain driver versions where the adapter enters a low-power idle state after a period of inactivity and fails to return to full operation when network traffic resumes. This causes periodic drops where the WiFi appears connected but routes no traffic. The issue is more common on laptops running on battery power with power-saving mode enabled.

Roaming Aggressiveness Set Too High or Too Low

Intel WiFi adapters have a Roaming Aggressiveness setting in Device Manager advanced properties. If set too high, the adapter constantly scans for stronger access points even when the current signal is adequate, causing drops during the handoff. If set too low, it stays connected to a weak access point when a stronger one is available. The recommended setting for office environments is level 3 (Medium).

802.11n Mode Interference

Some routers with both 2.4GHz and 5GHz on the same SSID (band steering) aggressively push the AX211 between bands. The band switch can briefly drop the connection during the transition. Disabling band steering on the router or setting a preferred band in the adapter advanced properties usually resolves this.

Fix 1 – Update Intel AX211 Driver from ASUS Support

1. Go to ASUS Support and search for ExpertBook B9 with your model number.
2. Select Windows 11 64-bit.
3. Download the WLAN driver – confirm it is the Intel AX211 or Intel Wi-Fi 6E driver.
4. Uninstall the current adapter driver in Device Manager with the option to delete driver software.
5. Run the downloaded Intel WiFi installer. Restart.

Fix 2 – Disable WiFi Adapter Power Management

1. Open Device Manager, expand Network adapters, right-click Intel AX211 and select Properties.
2. Go to the Power Management tab.
3. Uncheck Allow the computer to turn off this device to save power.
4. Click OK.

For the registry-level fix that persists through driver updates, navigate to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}

Find the subkey for the Intel AX211 (look for DriverDesc containing Intel) and set PnPCapabilities DWORD to 24 (decimal). This disables power management at the driver level permanently.

Fix 3 – Adjust Roaming Aggressiveness

1. Open Device Manager, right-click Intel AX211, select Properties, Advanced tab.
2. Find Roaming Aggressiveness in the property list.
3. Change the value from the current setting to 3 – Medium.
4. Click OK and test WiFi stability over 30 minutes.

Per Azman Hamzah, who is a procurement manager using an ASUS ExpertBook B9 for business travel, adjusting the Intel AX211 Roaming Aggressiveness to Medium and disabling the adapter power management completely eliminated the WiFi drop issue that had been occurring in hotels and office buildings with multiple access points.

Frequently Asked Questions

What WiFi adapter does ASUS ExpertBook B9 use?

The ASUS ExpertBook B9 uses the Intel Wi-Fi 6E AX211 or Intel Wi-Fi 6 AX200 depending on the model generation. Both are M.2 modules. Check Device Manager under Network adapters to confirm your specific model.

How do I check Intel AX211 driver version on ExpertBook B9?

Open Device Manager, expand Network adapters, right-click Intel AX211 and select Properties. Go to the Driver tab to see the current driver version and date. Compare this against the latest version on the ASUS support page for your ExpertBook model.

Why does ASUS ExpertBook B9 WiFi disconnect when switching between rooms?

The WiFi drops during room changes because the adapter is switching between access points (roaming). Set Roaming Aggressiveness to Medium in Device Manager advanced properties to help the adapter handle access point switches more smoothly.

Does ASUS ExpertBook B9 WiFi support 6GHz band?

Models with the Intel AX211 support WiFi 6E including the 6GHz band. Models with Intel AX200 support WiFi 6 on 2.4GHz and 5GHz only. Check your exact model specifications on the ASUS product page to confirm which adapter is installed.

Conclusion

ASUS ExpertBook B9 WiFi drops on Windows 11 are fixed by updating the Intel AX211 driver from ASUS Support, disabling adapter power management in Device Manager, and adjusting the Roaming Aggressiveness setting to Medium. These three fixes address the most common causes of WiFi instability on the ExpertBook B9. If drops continue only when moving between locations, the Roaming Aggressiveness setting is almost certainly the cause and setting it to Medium resolves it for most office environments.