Mapped drives disconnecting

>-----Original Message-----
>One of our xp pro workstations is connected to our small
>network, this one has a mapped connection to the drive on
>the server (same as others on the network)which is
>disconnected for no reason. Power settings are at minimal
>only turning off monitor & hard drive is set to never, no
>standby either. We have found a knowledge base article
>some time ago that directed us to the registry to adjust
>the value in the hkey_local
>machine_\system\service\lanmanserver\paramaters\a utodiscon
>nect to increase the value...which we have done to all
>our workstations & has eliminated mapped disconnections,
>but this one continues to disconnect after it goes idle
>during the night. Odd part is when you go to my computer
>the mapped drive shows connected, no red X...if you click
>on it after a few minutes xp message box advises an error
>occured while reconnecting & has not been restored!?
>Any help for what else we can do short of rebooting every
>day (only cure so far)would be greatly appreciated. Thank
>you in advance for your help & cooperation!
>.
>