A new MS Windows 2012 server was setup. It works as a DC and file server as well. Every desktops were automatically mapped several drives with file shares offered from this server. However, found that while in the Windows explorer, the user click any of the mapped drive, what the user can see is the "hour glass". And out of sudden, everything back to normal, and user can use files/folders in the mapped drives again.
What's went wrong? How to solve the problem?