@Kevin_Z So I tried everything. All other devices have near Gigabit speeds, my Archer C6 v2 with 1.3.6 Build 20200902 rel.65591(4555) firmware (latest) has 94 Mbps. The incoming wire is cat5e, router...

Hello! Yesterday I switched to a higher speed connection (should be 400Mbps). The repair man came and tested everything - wires, my PC and router - if I connect my PC directly to the line the speed...