Hello,

I'm having problems with my brand new AX20 router and thought maybe someone can help before I return it to the shop. 

When I took it out of the box, I could not get it working - it just did not connect. I had a Archer C50 router and it was working absolutely fine pretty much straight ouf the box (after I'd entered my PPoE credentials). But the green Internet light did not lit up on my AX20. So after getting some feedback from TP-Link CS, they told me to change the port Negotiation speed from Auto to 100Mbps and voila - the green light came on and LAN connection was established (I'm only talking about wired connections here - WiFi works fine and at full speed).

But now I'm stuck at much lower speeds over the cable. I have a solid 100/100 cable coming from the wall and with this 100Mbps Internet Port Negotiation speed I only get around 15Mbps down /90Mbps up when it used to be around 90Mbps both ways. As soon as I change the speed to 1000Mbps or Auto, the green Internet light goes off and connection disappears. 

As I said - internet cable is fine as it is working fine and at full speed with my old Archer C50 router. I've also done firmware update (automatic router update).

Any help is much appreciated.