Next time it happens, look in

Monitor - kernel - threads, and
NRM - profile/debug - Profile CPU execution by NLM

to see what is causing the high util.
--
Andrew C Taubman
Novell Support Forums Volunteer SysOp
http://support.novell.com/forums
(Sorry, support is not provided via e-mail)

Opinions expressed above are not
necessarily those of Novell Inc.