I have a Cat 6 50ft ethernet cable. My internet speed is 400mbps download and 20mbps upload. I switched my speed and duplex setting from auto negotiation to 1.0Gbps because I was being limited to 100mbps. It worked for about 3 days no issues, computer turned off about once a day. Then I came home today and it says Network Cable unplugged, checked the router, it handles up to 1Gbps for each port.