You can enable / disable the persistent connections feature
through the registry.For example when a user claims his drives
do not connect automatically and user had ticked in reconnect at
logon.You'll find the responsible key under the path below:

- HKEY_CURRENT_USER\Software\Microsoft\Windows NT
\CurrentVersion\Network\Persistent Connections

Doubleclick in the right pane the entry below:
SaveConnections

Set it's value to yes to enable persistent connections or to no to disable
them.

If the key is not there you need to create it as a REG_SZ [String Value]
(Rightclick in right pane , new , REG_SZ value).Name it as mentioned above.


Note:You may need to check this entry for All Users as well:
- HKEY_USERS\.DEFAULT\Software\Microsoft\Windows NT
\CurrentVersion\Network\PersistentConnections
You will need to log off and on or to restart your PC.
(Make sure that the Share name is typed correct at mapping the drive)