Ldap crashes with "too many executing" errors

[ram <ram@netcore.co.in>]

I am using Berkeleydb4.2 and openldap version 2.3.39  on a Centos 5 box
with a bdb backend


  The ldap server is used for backend authentication of users of imap
server using sasl. Even though we have a similar setup working in many
locations on a particular location I see ldap  server hanging ,
apparently anytime and cannot be reproduced 
I kept ldap running in the debug mode I could see something like 

--
connection_input: conn=5097 deferring operation: too many executing
ber_get_next
ber_get_next: tag 0x30 len 6 contents:
connection_input: conn=5097 deferring operation: too many executing
ber_get_next
----
When the ldap server hung. 

I restart ldap and thing start working fine 



How can I debug further 

Thanks
Ram