My Windows 10 desktop PC keeps waking up despite putting it into sleep mode. It’s pretty annoying as I prefer to just wake it up than wait for it to boot and login.
To help troubleshoot this issue could you open an administrator command prompt (type cmd on the start menu /search box, right click and choose run as administrator)
Run the following command: powercfg -devicequery wake_armed
Does the computer have the option to connect via wifi rather than ethernet and if so are you able to try it on wifi for a couple of days to confirm if it’s the ethernet connection/network card causing the issue?