There are times when hashing new files, and establishing new connections is very processor intensive. I'll give LW a few minutes to settle down. If that doesn't work, maybe you're being hit by one of the Apple/Java/Panther/QT problems.
The next time that happens, open Utilities->Console and see if it logs some error message to help you troubleshoot.
See
http://www.gnutellaforums.com/forumd...?s=&forumid=27 for links to more info.