If CloudLinux is a case, you should be able to see the limit hit with lveinfo command.
I have a feeling that the reason of the crash is new feature which supposed to perform cleanup against run away php processes. Check your log for incidents sequence. Mine indicates that first cleanup happens then suexec daemon gone.
Also please mind I run XCache Cacher v3.0.1 with LiteSpeed API V6.1 with out any issues.
With LiteSpeed API V6.2 I got a daemon crash every 10-12 hours.
Last edited by bobykus; 07-09-2013 at 06:22 AM..