I have an issue with Archer AX20 WAN port.
If I set it to auto-negotiation, it doesn't work at all. If I set it to 100Mbit full duplex (the actual connection speed), then it works but it is not very stable and it reaches max speed of 15mb/s. If i set 100Mbit half-duplex works 87mbit. My speed from ISP is 100mbps. Cables are fine, check with my PC directly, other routers ,etc.
If i connect the old router, automatically obtain the wan connection.
It seems like some incompatibility with the ISP network or firmware thing.
Anybody have or had similar issue?