Many of our users (not all) are experiencing a lock up or crash in DBA.  It will just quit functioning if it has been left open while not in use.  The greyed out functions will light and then it denies access to everything.  
 
At first we thought it was only the wireless stations but then we had reports of it happening on some of our hard-wired stations too.
 
We recently added 10 more users (for a total of 20).  Do you think this may be causing our problems?
 
Thanks for any help.