X server abort

Buddy Bell <[email protected]> Sat, 29 Mar 2003 21:22:07 -0500

Newsgroups	gmane.linux.redhat.release.seawolf
Message-ID	<[email protected]>

I am having problems with my X-server.  It will work fine for 15 min or 
more and then abort saying -
Fatal server error
Caught signal 4 - server aborting

what is signal 4 ?   Thanks for any help.  BB