samba - Nov 2004 - dying network drive connections with Windows 2000 Pro/Samba 3.0.7

Hi

I'm experiencing trouble with a Samba 3.0.7 installation and Windows
2000 Professional clients that lose their network drives after some
time.
The Samba server is acting as a Domain Controller for a single subnet
with about 10 clients (W2k Pro with Service Pack 2-4). At some (random)
time after the login the clients all have the same problem: the network
drive mappings die (sometimes a single drive, somtimes all drives).
In "lucky" circumstances the clients can reconnect just by opening
"My
Computer" and clicking on the drives. The problem with that ist that
some applications already have died then...
If the problem situation occurs the log shows the following entries:

Nov 11 14:11:40 server2 smbd[10750]: [2004/11/11 14:11:40, 0]
lib/util_sock.c:get_peer_addr(1000)
Nov 11 14:11:40 server2 smbd[10750]:   getpeername failed. Error was Der Socket
ist nicht verbunden
Nov 11 14:11:40 server2 smbd[10750]: [2004/11/11 14:11:40, 0]
lib/util_sock.c:write_socket_data(430)
Nov 11 14:11:40 server2 smbd[10750]:   write_socket_data: write failure.  Error
= Die Verbindung wurde vom Kommunikationspartner
zur<C3><BC>ckgesetzt
Nov 11 14:11:40 server2 smbd[10750]: [2004/11/11 14:11:40, 0]
lib/util_sock.c:write_socket(454)
Nov 11 14:11:40 server2 smbd[10750]:   write_socket: Error writing 4 bytes to
socket 23: ERRNO = Die Verbindung wurde vom Kommunikationspartner
zur<C3><BC>ckgesetzt
Nov 11 14:11:40 server2 smbd[10750]: [2004/11/11 14:11:40, 0]
lib/util_sock.c:send_smb(646)
Nov 11 14:11:40 server2 smbd[10750]:   Error writing 4 bytes to client.  -1.
(Die Verbindung wurde vom Kommunikationspartner
zur<C3><BC>ckgesetzt)

(As you see, it's a german Windows, the error messages mean
"Socket is not connected" and "Connection has been reset by
peer")

BTW this problem began almost exactly (an hour later or so) when we
added two Windows XP notebooks to the domain. A correlation of this to
the problem doen't make sense for me but I just wanted to mention it,
who knows ;-)

Does anybody have a clue what's going wrong here?
TIA
-- 
Bjoern Engels                                                OpenIT GmbH
 engels@openit.de                                           Jahnstr. 18
  PGP keyID 1024D/895F13C3                         D-40215 Duesseldorf
                                                                 :wq!