[Samba] Win2K Workstation Disconnecting Shares from Samba Server

[madmac madmac]

Team:

I have a Linux Server running Debian Testing (2.4.18
kernel) and Samba 2.2.3a-12.1

It's been running GREAT.  This is a marvelous product.

I have a minor issue, though.  

2 of the 14 Win2K (all at SP3 and fully "Windows
Updated") will "disconnect" the shares on the Samba
server after only a few seconds of inactivity.  This
isn't typically a problem, except that with a few
software packages (AutoCad, PhotoShop, Illustrator),
attempts to resave a file generate a "file not found"
error and bring up the Save As dialog.  They can then
navigate to the original shared directory and save,
but it's a hassle.

I've got to believe it's an obscure client setting on
the Win2K boxes, but I can't find anything about it. 
All the shares on all 14 workstations are made via a
login.bat, so these 2 workstations aren't mapping
anything differently from the other 12.

smb.conf included below:

TIA

madmac

;*******************section global*****************
[global]
printing = cups
printcap = cups
netbios name = gozer
workgroup = orbent
server string = %h server (Samba %v)
log file = /var/log/samba/log.%m
max log size = 1000
syslog = 0
security = user
encrypt passwords = true
socket options = TCP_NODELAY
local master = yes
os level = 99
domain master = yes
preferred master = yes
wins support = yes
dns proxy = no
unix password sync = True
passwd program = /usr/bin/passwd %u
passwd chat = *Enter\snew\sUNIX\spassword:* %n\n
*Retype\snew\sUNIX\spassword:* %n\n .
pam password change = no
obey pam restrictions = yes
admin users = root
domain logons = yes
logon drive = H:
logon script = logon.bat
logon home = \\gozer\%u
logon path = \\%N\profiles\%u

;*******************section
QuickBooks*****************
[QuickBooks]
comment = QuickBooks Data Files
path = /home/samba/quickbooks
writeable = yes
create mask = 770
directory mask = 770
locking = yes
oplocks = no

;*******************section projects*****************
[projects]
comment = Orb Enterprises Projects Directory
path = /projects
writeable = yes
create mask = 770
directory mask = 770
locking = yes
oplocks = no

;*******************section homes*****************
[homes]
comment = Home Directories
browseable = no
writable = yes
create mask = 0600
directory mask = 0700
path = %H
read only = no
valid users = %S

;*******************section netlogon*****************
[netlogon]
comment = Network Logon Service
path = /home/samba/netlogon
guest ok = yes
writable = no
share modes = no

;*******************section profiles*****************
[profiles]
comment = Directory Profiles
path = /home/samba/profiles
guest ok = yes
guest_account = nobody
writeable = yes
create mask = 0600
directory mask = 0700

;*******************section printers*****************
[printers]
comment = All Printers
browseable = no
path = /tmp
printable = yes
public = no
writable = no
create mode = 0700

;*******************section cdrom*****************
[cdrom]
comment = Samba server's CD-ROM
writable = no
locking = no
path = /cdrom
public = yes
preexec = /bin/mount /cdrom
postexec = /bin/umount /cdrom


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