samba - Jun 2009 - winbind is very slow. log.winbind shows errors

Hi,

Server: Debian Lenny with Samba 3.3.4 .

log.winbindd shows this:

[2009/06/10 09:01:13,  0] libsmb/namequery.c:saf_store(75)
  saf_store: refusing to store 0 length domain or servername!
[2009/06/10 09:01:23,  0] libsmb/clientgen.c:cli_receive_smb(165)
  Receiving SMB: Server stopped responding
[2009/06/10 09:01:23,  1] winbindd/winbindd_cm.c:cm_prepare_connection(967)
  failed tcon_X with NT_STATUS_IO_TIMEOUT
[2009/06/10 09:01:26,  0] libsmb/namequery.c:saf_store(75)
  saf_store: refusing to store 0 length domain or servername!
[2009/06/10 09:01:36,  0] libsmb/clientgen.c:cli_receive_smb(165)
  Receiving SMB: Server stopped responding
[2009/06/10 09:01:36,  1] winbindd/winbindd_cm.c:cm_prepare_connection(967)
  failed tcon_X with NT_STATUS_IO_TIMEOUT
[2009/06/10 09:01:39,  0] libsmb/namequery.c:saf_store(75)
  saf_store: refusing to store 0 length domain or servername!
[2009/06/10 09:01:48,  1]
rpc_client/cli_pipe.c:cli_pipe_validate_current_pdu(755)
  cli_pipe_validate_current_pdu: RPC fault code DCERPC_FAULT_OP_RNG_ERROR
received from host REY-SERVER, pipe \lsarpc, fnum 0x7445!


Any Ideas?
I dont know what to do with these messages.

Thank you,

JonnyD