Go to settings. Select Network & Internet. Select Change Your Network settings. Right-click your Ethernet or Wi-Fi and select Properties. Look for the power/energy settings. Make sure to uncheck the box which says that this computer is allowed to turn off your modem/router to save power/energy. Apparantly, after the latest Windows Update, my PC was turning my modem/router off to save power/energy at seemingly random intervals, which resulted in receiving quite a variety of different errors. This won't fix all other issues you might still experience, but for me this error has been fixed.
Good luck! (and hopefully see you soon in Tamriel!)