Markus, your screenshot shows a network-manager error:

  nm-dispatcher.action: Caught signal 15, shutting down...

This indicates that some part of NM is not being correctly guarded from
/etc/init.d/sendsigs, resulting in abnormal termination that breaks the
network connection before network filesystems are being unmounted.
Network Manager has previously been fixed for such bugs, but it seems to
have recurred.

Please file a new bug report against the network-manager package
including the screenshot and this information, and paste the number of
the new bug here.

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https://bugs.launchpad.net/bugs/211631

Title:
  Network is brought down before network filesystems are unmounted (CIFS
  timeout at shutdown)

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