Just installed the latest Windows 7 Client and hoped
it would solve the problem of occasional empty mapped drives.

This has been a real headache as I am constantly getting calls
from users that their files have disappeared. They reboot
and the files are back, but sometimes only temporarily.

Now it is even worse. After rebooting several times now
I cannot see any files on certain drives. They are drives
mapped to NW6 SP8 servers.