NLB with Terminal service broadcast storm

Hello,
I have 2 windows 2003 server with terminal service enable
on it. When I enable load balancing on them and the
traffic goes higher, it froze all my network (I think it's
causing a broadcast storm). I configure my switch to have
ip snooping and I enable ICMP multicast on the load
balancing and it still do the same thing. Do you have
another suggestion? Do i need to use a third party box to
do my load balancing? Do you know a product that can do
the job.

Thanks!