Typically mapping local resources works correctly when connecting to the server via RDP. In the Local Resources section, select the drives you would like to map, connect to the server and they show up. Well this has recently stopped working (for no apparent reason) and acts rather intermittent. It will map correctly for a few weeks and then just stop allowing you to map ANY drives through the RDP session. IF you restart the server, everything works correctly again. There are no errors in the Event Viewer for not being able to map the local resources and clearly there is no GPO that is affecting the mapping as well as anything local to any machine RDPing to the server since it works most of the time. As a note this issue happens on several different servers running Windows Server 2008 R2 (with all of the most recent Windows updates) and to ALL users attempting to map local resources after the "problem" occurs.
Any suggestions or ideas as to what might be happening would be GREATLY appreciated.