@OwainG I still have the same problem. To temporarily solve the issue I checked which of my ports were active at 1000Mbps Full Duplex and connected the one I need to run at 100Mbps to that port. This...

@Marvin_S Firstly, thank you for all of the advice on these threads, it has helped me solve the problem (temporarily) and get back to my actual 1Gbps limit as below. I have Archer AX50 but the...