samba - Aug 2008 - Receiving SMB: Server stopped responding

I have this message coming every 20 seconds in winbind log.

[2008/08/16 11:23:18,  0] libsmb/clientgen.c:cli_receive_smb(165)
  Receiving SMB: Server stopped responding

This is a samba/winbind setup with ldapbackend (editposix feature).

I have seen error message in a post of last year but no final 
explanation of the issue:

http://lists.samba.org/archive/samba/2007-August/134178.html

version is samba-3.2.1

Any ideas if this error would keep me from setup samba in productional 
environment?

Cheers,Gunnar

This seems to be an ongoing, never-ending problem with our installation of Samba
3.0.31,
patched, running in FreeBSD 7.0 Stable RELENG updated.

tail -f /var/log/samba/winbindd.log

[2008/08/28 10:26:31, 0, pid=1839] libsmb/clientgen.c:cli_receive_smb(111)
   Receiving SMB: Server stopped responding
[2008/08/28 10:26:43, 0, pid=1839] libsmb/clientgen.c:cli_receive_smb(111)
   Receiving SMB: Server stopped responding
[2008/08/28 10:26:56, 0, pid=1839] libsmb/clientgen.c:cli_receive_smb(111)
   Receiving SMB: Server stopped responding

And, it seems to be both periodical at times, then completely random.  The thing
just
stops responding to winbinds for no logged reason.

Is there any way to get Samba to tell me what the devil it's doing while
it's busy
ignoring everything?

So long as network use is light, there's no problem.  I also wonder if
it's possible that
it just decides to stop responding under some particular amount of arbitrary
load, or
perhaps the NIC's bandwidth being close to max causes it to lock up. 
I'm grasping at
straws.  I've got well over 50 hours in troubleshooting this thing and no
real leads on
why it's periodically just refusing connections... then coming back with no
fanfare.

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