I have CAT5e cable, 2.5Gb Ethernet adapter, and 500mbps subscription but I only get ~100mbps. I changed Speed & duplex settings from Auto Negotiation to 1.0gbps and nothing changed. Then I changed it to 10mbps and then again to 1.0gbps and it worked, I had 500mbps but after I restarted the pc it was capped again at 100mbps and doing the same thing didn't work this time. In windows settings it shows that my internet speed is 100mbps. What can I do to get 500mbps again?