[kumaichi]

Do you set anything in the ethernet settings?
Because its not necessary

If you want to be sure
I would prefere

Install a fresh clean windows and all have to work fine

The only settings I have for my ethernet settings is a static IP.  I did that to use the dhcpsvr.exe instead of having to use an external router.

I backed up the laptop in March after I get everything working correctly.  I could restore that backup and maybe turn off windows updates.  I'm convinced it's something with the tablet but can't figure out why or what changed.