[Samba] connecting to samba from 2003 sbs domain client running xp

Hi everybody,
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I have a network which consists of a linux data server, running Samba, a
windows 2003 sbs, and a few xp professional clients which login to the
domain server (2003 sbs).
On the linux box, samba is running, this pc is always on. When i start
the client pc (xp profi) and login to the domain, i can access the samba
shares at full speed.=20
Now the problem: When the xp profi client is left alone, for about 15 to
30 mins, something happens to the network. When i then try to access the
shares, browsing is slow as H**L.
Sometimes coming with screens like : enter user/passwd.
The only remedy is to logout the user on the xp terminal, log back in,
and everything is fine again. I have samba running in the most simple
sharing system.
This is the samba config file.. :=20
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DATASVR ~ # cat /etc/samba/smb.conf
[global]
netbios name =3D DATASVR
server string =3D DATASVR
socket options =3D TCP_NODELAY SO_RCVBUF=3D16384 =
SO_SNDBUF=3D16384
workgroup =3D GOVALOKAAL
socket address =3D 10.0.0.200
max log size =3D 1000
log file =3D /var/log/samba/log.%m
security =3D share
guest ok =3D yes
guest account =3D samba
encrypt passwords =3D true
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[stuff]
comment =3D All stuff
path =3D /raid/stuff
writable =3D yes
browsable =3D yes
read only =3D no
guest ok =3D yes
public =3D yes

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I once, tried to let the sbs figure out who could access the linux box,
but that didnt seem handy to me. To do this i had to add the linux box
to the sbs domain. The account for the linux box on the sbs is currently
disabled. Ive also tested it with this account enabled and this didnt
seem to make much of a difference.
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Does anyone have any idea on where to start looking, or what to do ?
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Best regards,
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Martijn
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