DHCP server vs. Windows XP SP3

[whoudre]

Added to proper section. Thanks.

Try to find your new post but I can't.

So all my computers with XP SP3 (350 workstations) see there DHCP disconnect during or after the login and reconnect after 5-10 seconds.
Most of time, they lost network map drive for 10 seconds, pcounter ppopup crash, cannot find context or ldap server for contextless login.

All my computers have a IP address set with there mac address (bootp).
With a random dhcp dynamical address or with a manual fixed address, all is fine...

When it crash, I have an error in windows system events they said that dhcp connection was lost and reconnect 5-15 seconds right after...

I have found that if I remove check box for iee 802.1x on my network card properties (In windows workstation) all is ok... But try to find if I can solve it with a patch or client options or something else. I try client sp4 and sp5 but still same error.

Thanks