Multiple server lockups

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Over the past week I have had 3 different production web servers lock up 
with no errors, warnings, or any other indications in any log, process 
accounting, anything (I combed the systems high and low for any indication 
of any abnormal behavior, but everything checks out perfectly fine, 
including hardware diagnostics). They are all Dell PowerEdge servers, but 
different models, different hardware, etc. They all share the same Red Hat 
7.2 configuration. They went through a quarterly patching update in early 
May (including an update to kernel 2.4.18-27.7.x), followed by a security 
update at the end of May (including an update to kernel 2.4.20-13.7).

Has anyone else experienced any such problems with the recent Red Hat 
errata? The only changes to the systems have been these updates. I'm 
hesitant to rollback all these updates, given the security implications, 
but I don't know if I'm going to have any other option if I can't narrow 
down the problem.

Thoughts? Ideas? Suggestions?

Many thanks,

Doug
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