We have some people who connect to our local domain which is run on SBS2011.
They all run win 7 Pro 64 bit.
They use redirected folders to connect their desktops, their "My Documents", and their Favorites.
A few of the users lose their desktop icons periodically.
The connection still seems to be in place to the server because their desktop background does not change when this happens and also, they do not get a warning message telling them anything.
This does not happen to everyone, but it does happen to some.
To restore the icons they have to log off and then log back on, or they reboot etc.