system locking up during scans

I am doing some scans of external systems at my office and have a box, the
only one available to me at the time setup with CentOS 4.4 on a P4 2.8 with
512 megs ram.  It is running a minimal install of the OS and does nothing
but Nessus.  I start a scan or two /24's hitting all the ports and using all
the checks and it locks up for hours, it will then do a burst of checks (I
gather this from my logs and my IDS) and then freeze up again.  I have it
set to only do 5 checks per host and a limit of 5 hosts at a time.  I figure
with it set that low it should be able to handle that load, am I missing
something?   I have not used Nessus in a while but never had problems like
this before.  Thanks in advance for any help you can lend.  I am using the
current version of everything, it is a fresh box loaded on Monday.



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