Ethernet Connection Limited to 100Mbps Instead of 1Gbps

[Windows 10]

Hello!I have a GA-B85M-D3PH motherboard that supports 1Gbps connections, but I've only been able to achieve that speed for two days. After that, my connection remains stuck at 100Mbps. I verified this both through speed tests and in the Ethernet properties.I'm using Windows 10 Pro (fully updated), along with the Realtek driver version 10.73.815.2024. The "Speed & Duplex" setting is manually configured to 1Gbps, and I'm using a Cat5e cable.From what I can tell, everything seems to be properly set up. I even tested the same cable and connection on a laptop running Windows 11, and it worked p

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