samba - Jan 2003 - PDC seems to disappear (only service restart helps)

Hi,

I have a curious problem with Samba as a PDC:

After a while (can't say exactly when) Samba disallows me to join new
machines to the 
Domain or to change my password. The client says: "Can't find domain
XXX".
After a 
restart of smbd and nmbd it works, until the next error like this occure.
Even a version 
change from 2.2.4 to 2.2.7 doesn't change the situation. Samba is configured
as a PDC 
with Profile Roaming. Clients are mostly Win2K.

Any hints?

Greets
Sascha

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