[Samba] Samba PDC and Windows XP clients - login timeout after 15 minutes

[X-Dimension]

Hi!

We are using a Samba PDC with 40 Windows XP clients and have some strange  
problems.
When a user starts his Windows computer and don't login within the next 15  
minutes
(because he drinks a cup of coffee) and tried to login after that time he  
get the message,
that the server-profile could not be loaded and a temporary profile is  
used instead.

There are absolutely no problems when a user starts his computer and log  
in within the next 15 minutes,
but after this time period he always get the error described above.

Any ideas what goes wrong?

THX

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