I just switched from a power line adapter to straight Ethernet and my speeds quadrupled ... when it doesn’t disconnect itself. I’ll have my pc idle and it will stay connected until I try to download something or run a speed test. It reconnects a few seconds after the download or Speed test times out. I’ve tried another pc and Xbox one, both got great speeds and no problems. I have an intel l211 gigabit network connection on my motherboard with all the drivers up to date. I also have a fiber connection.