Are you experiencing long shut down times ? Is it taken some minutes after you click on shut down before windows finally shuts down your computer ? This problem could be caused by unloading the current user profile.
This can happen when third party, or even Microsoft applications have not properly cleaned up when exiting. Windows will keep trying to unload the profile until Windows finally decides that it can’t and should shutdown. Even if you find the application causing the problem - it may be impossible to do anything about it.