ADO/SQL Server7

We have an app written in Delphi 5 using OLE DB Provider for the
connection to the server in the ADO Connection component.  Randomly
where the user enters data the lookup combo boxes will display their
stored values not display values when they first open the screen .  It
appears that the server is timing out randomly.  If they close the
application and wait a few minutes to reopen it everything is fine.
Anyone experience anything like this.