Hello !

I have a TP - Link Archer C80 router, that sets my gigabit internet to 100Mbps Full Duplex and my internet speed is capped to 90 Mbps. I tryed to set it at 1000Mbps Full Duplex, and it worked for around 10-20 minutes at full speed of 600 Mbps internet speed. Sometimes I had spikes between 2 to 5 minutes where the internet breaks. Now the problem is that I can't change the Duplex from 100 to 1000 and the internet is very bad. I tryed connecting a laptop to the main router via cable and it worked fine. The problem is in the router and I can't find solution for the last 1 week. Before that everything worked great.