From Win 10 settings, select Network, then Change Adapter Options, right-click on the Ethernet network used, select Properties, then the Configure Button, and select the Power Management tab. Is the option "Allow the computer to turn of this device to save power" unchecked?
Have you also restarted any modems and routers?
Finally, search for "Power Options" in the Windows search box. Is the system set to High Performance? Go over the settings. Are you satisfied with the time limits set to turn off the monitor, hard drive, etc? In my case, I don't have anything turned off and I set anything for maximum output, power use, etc., in order to get the best performance.