windows error 1312 with share mode access

[JANTZEN, Eric]

Hello,
 
I have a big problem:
- on a solaris 2.6 server, I have a samba server (v2.0.6) with share mode
acces
and encrypt password.
- on my NT4 client, when I connect this share, that work well
but if I disconnect and reconnect too quickly, I have a windows error:
"system error 1312..."
And I don't have this problem, if I wait some seconds. But I can't wait.

What is the problem, and can I find a solution??
 
Thanks
 
here is my smb.conf:
 
[global]
  workgroup = OUR-DOM   
  server string = acces restrited
   log file = /var/opt/samba/log.%m
   lock dir = /var/opt/samba/locks.cursa
   max log size = 50
security = share
  encrypt passwords = yes
   socket address = 10.10.20.6
   socket options = TCP_NODELAY 
interfaces = 10.10.20.6/255.255.0.0
   dns proxy = no 
preserve case = yes
short preserve case = yes
  character set = iso8859-1
  create mode = 660
  directory mode = 755
netbios name = cursa
  debug level = 5 
[tmp]
  path = /tmp
  writeable = yes
  public = no
  browseable = no
  user = ppricorp
  valid users = @IAO
  force user = ppricorp
  force group = IAO

 
Eric JANTZEN                                    04 72 93 60 04
eric.jantzen at crit.rhone-poulenc.com
<mailto:eric.jantzen at crit.rhone-poulenc.com> 
Rhone-Poulenc Technologie
Decines
FRANCE