p0et wrote How about use wireless connection? And whether there are some interference in your circuit? Have you changed the QoS? Wifi in that room comes from a WiFi Powerline Extender so probably...

Model : Hardware Version : Firmware Version : ISP : I have recently upgraded to fibre broadband and Ookla speed test reports 50Mb down and 20Mb up. I use a TP-link TL-PA4010 to inject the broadband...