Ethernet unplugged - > not connected/cable unplugged

Like the title says, it says ethernet unidentified and then unplugged all within 2 seconds and it keeps happening again, and again, I can fix this by going to adapter properties then qos packet scheduler - > configure - > advanced and change speed & duplex to 10mbps half or full. However when I do this it remains constant unidentified network and I cannot access the Internet. Was most likely after an update and I have no system restore and uninstalling the update tells me undoing changes. Please help. Thanks.  PS after I do the qos packet scheduler thing and use the troubleshooter it says ethernet doesn't have a valid ip configuration. I've watched tens of hundreds of videos to fix this problem yet it remains unfixed. Please help thank you.