stop cluster node automatic

Hi
I using ejabberd 15.04 and cluster 3 nodes. after some days I see one node is not in cluster.

mnesia:info() in node 1 returns
running node 1, node2
stopping node node 3

mnesia:info() in node 2 returns
running node 1, node2
stopping node3

but mnesia:info() in node 3 returns
running node3
stopping node1, node 2

every nodes are running. I am noticed that when somebody could send message to one but couldnt send to another one and I checked mnesia:info().
what s wrong? why? I restart node 3 and become running node 1, node2, node3 for all nodes.
but I done want restart node and how to fix that dont happen again?

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