RPCss consumes 60+% CPU on Windows 2003 Small Business Server

Hi,

I have a Windows 2003 Small Business Server that has rpcss consuming 60+%
cpu consistently. Any one have any idea why this is happening and how can I
fix it more permanently? I can reboot and that should fix it but I am looking
for something more permanent.

I read a bunch of articles that address issues in Windows NT and Window 2000
with RPC spoofing and GetTickCount usage - though I presume those have been
erradicated in Win2K3. So I guess I am at a loss at why this is happening.