Elastic nodes looks connected, but it is not

I have a weird problem here. I have 12 nodes and all are connected and joined in cluster but when i do run node statistics (192.168../_nodes/stats) it gives me 11 nodes only. When I do /_cat/shards , for one node which is having problem it shows shards are started but no of documents, storage details do not show up.

What could be the problem? I restarted the problematic node, all got well. But after some time another node started showing same behavior. This is becoming communicable disease now. Not able to understand the behavior.

check the elasticsearch.log to get more useful information.

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