SOS ckrashes the network connection with win2k

Hello folks !
I'm new to this list, so it's possible that my question had already been 
asked...but I didn't find anything in google.

First, let me describe my platform :
Server is a win2K with VSS6.0c SP6, SOS server is 3.5.3
The client is a win2k with SOS client 5.3.5

Now the problem :
When I perform a "get latest version" or a "diff" recursively on a big 
project using SOS, it crashes the network interface. The system is 
responding, but no more network access is available. If we try to 
restart the network, it fails. The only way to restart network is to 
reboot the server... hummm.
Note that the VSS database where on another server before (NT4) and 
worked well. We moved the database on a new win2k server and now I crashes.
We also check the database with the analysis software and there was no 
errors.

Any ideas about this ?

Thanks.
Nicolas.