Windows network shares disappearing when users are logged on to Mac

We are having some problems with windows network shares disappearing when users are logged on to Mac computers.
We have a number of Mac labs that users can logon to using their AD login credentials. Their network shares are saved on a windows file server. The ad plug has been configured on each client Mac as has the LDAP plug-in. It is configured to connect to the Xserve which is running as an OD master. The system preferences for the client Macs are being managed from the Xserve.
The problem for the users is that they can log into the Mac no problem and they can see their network share appearing on the desktop and in the dock, but for some reason on random Macs and with random users the network share disappears. If they log off and log back in again the network share is still missing. As it happens randomly I can not put my finger on what the problem is.
Most labs either have Intel iMacs running 10.4.11 or Intel iMacs running 10.5.5
Any help will be appreciated
Noel Patterson
Southern Regional College
Northern Ireland

Mike,
We need to know some basic scoping information to provide any further input.
1)
Is the user prompted that the server will be shutting down?
2)
Does Task Scheduler show that the task ran at the scheduled time?
3)
Are there any errors in %windir%\tasks\schedlgu.txt?
4)
Does the problem still occur if the machine is in its own OU with blocked inheritance?
Does the problem still occur in a clean boot configuration with MSConfig
Steps to clean boot machine:
================
Start > Run > Msconfig > Select Services > click "check box", "Hide all microsoft services" > Disable all
Start > Run > Msconfig > Select startup> Disable all
Reboot
Thanks,
ankit

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