nic tlan teaming – packets dropped

I have a compaq proliant 1850r server with two netelligent 10/100 TX UTP nics – one embedded, one in a PCI slot. I have installed Tlan teaming on the server and are subsequently suffering from packets being randomly dropped. Removing the teaming solves the problem. Comaq don’t know what is causing this – any ides? (I am running the latest drivers etc on NT 4 server in the enterprose with SP% installed).)