Samba problems

Hi, I have 10.4.7 Server, AFP, Samba, OD. The server is an OD master, bound to AD machine for auth. My Windows users lose access to server in random time, several times a day. Samba log is full of following entries: [code] [2006/06/30 09:41:46, 0] /SourceCache/samba/samba-92.19/samba/source/lib/util_sock.c:write_socket_data(446) write_socket_data: write failure. Error = Broken pipe [2006/06/30 09:41:46, 0] /SourceCache/samba/samba-92.19/samba/source/lib/util_sock.c:write_socket(471) write_socket: Error writing 4 bytes to socket 23: ERRNO = Broken pipe [2006/06/30 09:41:46, 0] /SourceCache/samba/samba-92.19/samba/source/lib/util_sock.c:send_smb(663) Error writing 4 bytes to client. -1. (Broken pipe) [2006/06/30 09:45:19, 0] /SourceCache/samba/samba-92.19/samba/source/smbd/service.c:make_connection(800) weiszova-2k (192.168.6.42) couldn't find service bmserver [2006/06/30 10:04:17, 0] /SourceCache/samba/samba-92.19/samba/source/lib/util_sock.c:get_peer_addr(1016) getpeername failed. Error was Socket is not connected [2006/06/30 10:04:17, 0] /SourceCache/samba/samba-92.19/samba/source/lib/util_sock.c:write_socket_data(446) write_socket_data: write failure. Error = Broken pipe [2006/06/30 10:04:17, 0] /SourceCache/samba/samba-92.19/samba/source/lib/util_sock.c:write_socket(471) write_socket: Error writing 4 bytes to socket 6: ERRNO = Broken pipe [2006/06/30 10:04:17, 0] /SourceCache/samba/samba-92.19/samba/source/lib/util_sock.c:send_smb(663) Error writing 4 bytes to client. -1. (Broken pipe) [2006/06/30 10:04:18, 0] /SourceCache/samba/samba-92.19/samba/source/smbd/service.c:make_connection(800) 192.168.6.34 (192.168.6.34) couldn't find service bmserve [/code] The server is WG Master, Domain Master Browser, WINS is enabled. Any idea?