still Problems with Network-Connection

[Cyberduck1]

Hello Users,
my Samba is running fine but sometimes the Networkpath disapears from Win-Clients.
It is absolutely not relevant if there are files open.
The only message that hint to this Problem is the following:

[2002/04/30 15:42:47, 5] smbd/files.c:file_free(339)
  freed files structure 9429 (0 used)
[2002/04/30 15:42:47, 3] smbd/sec_ctx.c:set_sec_ctx(314)
  setting sec ctx (0, 0) - sec_ctx_stack_ndx = 0
[2002/04/30 15:42:47, 5] smbd/uid.c:change_to_root_user(216)
  change_to_root_user: now uid=(0,0) gid=(0,0)
[2002/04/30 15:42:47, 3] smbd/connection.c:yield_connection(48)
  Yielding connection to 
[2002/04/30 15:42:47, 3] smbd/server.c:exit_server(492)
  Server exit (oplock break failure)

At the time when this message was generated, I've bin copying a folder with several files from NT to Samba.
The versions I am using is 2.2.3a and NT4, SP6a / 2000 SP2.
I tried three different networkadapters in the Linuxbox and two different cables.
Has anyone any idea?
Please Help...
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