a clustering problem

we have installed ejabberd cluster nodes

and authenticating method is LDAP

and i adjusted all of the database table elements "RAM copy", "RAM&Disk copy" or "Disk copy" at web interface so all of the nodes are master (http://www.planeterlang.org/en/planet/article/Ejabberd-Cluster_Database_...)

every thing is good while all of the nodes are working

but the problem is that:

when a nodes service is stopped other nodes dont work regularly until the stopped node started up and stood up again
when a nodes service is stopped on other nodes users dont fall down however users couldnt sign in a long time

so what is the problem
any body come accross with a case like this
i can supply more information about our configuration if you want
i m waiting for your suggestions

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