Windows 10 Ethernet Falls Back to 1Gbps to 100Mbps Randomly: Solution
If you are experiencing issues with your Windows 10 (version 20H2, build 19045) Ethernet connection randomly falling back from 1Gbps to 100Mbps, this article will provide a detailed explanation of the issue and a step-by-step solution.
Background
The issue is related to the Realtek PCIe GbE Family Controller motherboard driver and the ASUS RT-AC66U router. The network interface on the router is 1Gbps capable, and the connection is wired Ethernet.
Issue
The issue occurs randomly, causing the Ethernet connection to fall back from 1Gbps to 100Mbps. This can be frustrating, especially if you rely on a fast and stable internet connection for work or entertainment purposes.
Cause
The root cause of the issue is a compatibility problem between the Realtek PCIe GbE Family Controller driver and the ASUS RT-AC66U router. The driver may not be optimized for the router's settings, causing the Ethernet connection to fall back to a lower speed.
Solution
To resolve the issue, you will need to update the Realtek PCIe GbE Family Controller driver to the latest version and adjust the router's settings. Here are the detailed steps:
- Press the Windows key + X and select Device Manager.
- Expand the Network adapters section and right-click on Realtek PCIe GbE Family Controller.
- Select Update driver and then Search automatically for drivers.
- Wait for the driver to be updated to the latest version.
- Access your router's settings by typing its IP address into a web browser (usually 192.168.1.1 or 192.168.0.1).
- Log in to your router (the default username and password are usually admin).
- Go to the Wireless section and change the Wireless Mode to 802.11n only.
- Save the changes and reboot your router.
After following these steps, your Ethernet connection should no longer fall back to 100Mbps randomly. If the issue persists, you may want to consider contacting ASUS support for further assistance.
References
ASUS Support. (n.d.). How do I log into my router? Retrieved from https://www.asus.com/support/FAQ/1012583/
Realtek. (n.d.). Realtek PCIe GbE Family Controller. Retrieved from https://www.realtek.com/en/products/communications-network-ics/item/rtl8111hp
ASUS RT-AC66U. (n.d.). Retrieved from https://www.asus.com/Networking/RTAC66U/
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