Some ideas to narrow down the problem:
- configure the ldap-status url and see if it gives any useful information 
while the problem appears
(see http://httpd.apache.org/docs/2.2/mod/mod_ldap.html )
- increase apache loglevel
- use netstat to watch the number of connections from apache to slapd
- possibly increase ldap cache sizes

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If many queries come in too quickly, apache2 freezes.
https://bugs.launchpad.net/bugs/234367
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