Windows can not reconnect to my next cloud via webdav

Plain windows is known to have a few bugs:
http://sabre.io/dav/clients/windows/

Take a look at mountain drive, raidrive, netdrive and others for virtual disk integration. ownCloud has already a virtual drive mode integrated in their client, and Nextcloud is also planning it for the near future (desktop client development is kind of slow, so don’t expect a working solution too soon):