My internet speed was OK (100mbps) until i started to notice bad latency (up to 400ms) and slow speed, 10mbps. I noticed that in router settings negotiation speed of my LAN which connects to pc, dropped from 100mbps full duplex to 10mbps half duplex. I basically cant play any games right now. I also have connected one more ethernet cable, which is my set top box for TV which is ok and runs with 100mbps and full duplex. I dont think that my cable is too long or broken. As I said it happend out of nowhere... Any way how to fix that?