[389-users] 389-ds error "timeout"

Hello List,

We are running a old ldap version:389-ds-base-1.3.7.5-24.el7_5.x86_64 and seeing the following error in ldap logs every couple of secs . A 389-ldap reboot did not help , where we shall look next ? ( this is a slave read-only ldap cfg  master-slave replication)

Also  is there a way t find which connections is generating this errorm in top of ldap we have l/b ( load balancer)

:11:11:08.497659877 -0700] - ERR - slapd_poll - (166) - Timed out
:11:11:11.597441065 -0700] - ERR - slapd_poll - (235) - Timed out
 thank you !