[Samba]Samba clients disconnect periodically

[PIOTR Walczak]

Hello,
I have a problem with samba. Clients  (Mac OSX 10.3.9, 10.4.10 and 
Windows XP) disconnect periodically.
Samba (v3)  runs on RedHat 3 enterprise.
Mac OSX workstations communicate with RedHat server via samba protocol 
only ( Netatalk is not installed).
OSX workstations are disconnected sometimes after 10 minutes, sometimes 
after 60 minutes.
Windows XP workstation disconnects after few days.
Samba logs for MAC OSX client says:
walczak (192.168.8.4) connect to service heineken_acc initially as user 
pietrucha (uid=555, gid=10) (pid 25147)
[2007/11/15 09:55:01, 0] lib/util_sock.c:read_socket_data(384)
   read_socket_data: recv failure for 4. Error = Connection reset by peer
[2007/11/15 09:55:01, 1] smbd/service.c:close_cnum(841)
   walczak (192.168.8.4) closed connection to service heineken_acc
smb .conf is attached.
Thank you in advance.
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Piotr Walczak