I added a Windows network drive (accessed using WiFi) in my fstab about a month ago:
//Server/Location/foo/bar /media/myNetworkDrive/ cifs auto,iocharset=utf8,uid=umang,credentials=/root/.cifscredentials,file_mode=0775,dir_mode=0775 0 0
and it works perfectly well, except it takes about a full minute for the system to shutdown. I have tried the solutions posted on the help wiki, the team wiki and on this blog. One of them worked for a few shutdowns but then the system went back to taking a minute to shutdown again.
EDIT: I'd like a working working around for this problem. Currently, I have a script that unmounts (password required for super-user priviledges) and then shuts down the computer, but I'd like to be able to shutdown the usual way and have it shutdown as fast.