USB-C ethernet randomly stops working, goes back to normal when unplugged then replugged

Troubleshooting Intermittent USB-C Ethernet Connectivity Issues on ASUS Windows 11 Laptop

Many users have experienced sporadic network disruptions when using USB-C to Ethernet adapters, and these issues can be particularly perplexing when traditional troubleshooting steps don’t yield results. If you’ve encountered frequent disconnections where your wired network connection suddenly drops and only resumes after reconnecting your USB-C port, you’re not alone. Here’s a comprehensive overview of this common problem and some practical solutions to restore stable Ethernet connectivity.

Understanding the Issue

The problem manifests as the Ethernet connection dropping intermittently, with the network indicator showing disconnection. Interestingly, physical inspection of the RJ45 port and Ethernet cable often reveals no visible anomalies—lights on the port remain active, indicating a physical connection. Despite this, unplugging and replugging the Ethernet cable itself typically does not resolve the issue. Instead, the fix involves disconnecting and reconnecting the USB-C connection to the laptop.

This behavior suggests that the root cause might be related to how the system recognizes and manages the network interface, particularly around USB-C port handling and driver interactions, rather than a straightforward hardware fault with the Ethernet cable or port.

Common Causes and Factors

• Driver Compatibility or Outdated Drivers: The Ethernet or USB-C port drivers may be outdated or incompatible with Windows 11.
• Power Management Settings: Windows power management configurations might be putting the USB-C port into a sleep state, interrupting network connectivity.
• Hardware Limitations: Some USB-C to Ethernet adapters may have compatibility issues or may not be fully supported in certain system configurations.
• System or BIOS Settings: Incorrect BIOS or system configurations can interfere with hardware detection or operation.

Recommended Troubleshooting Steps

1. Update Network and USB Drivers

2. Visit the ASUS support website for your specific laptop model.

3. Download and install the latest drivers for the USB-C port and Ethernet adapter.

4. Repeat the process through Windows Device Manager: right-click the device and choose “Update driver,” then select “Search automatically for updated driver software.”

5. Check Power Management Settings

6. Open Device Manager.

7. Locate your USB-C and Ethernet devices.
8. Right-click and select Properties.
9. Navigate to the Power Management tab.
10. Uncheck “Allow the computer to turn off this device to save power.”

11. Apply changes, then restart your laptop.

12. **Disable and Re-enable the Network