Websocket with Autobahn stop responding after some hours

I have a weird problem with Autobahn|JS and the push API on Poloniex.com. I connect to their API to fetch all messages in their chat and after 1-2 hours, the websocket close without errors, nothing to help me to debug.

I have tested the behavior in 3 langages (PHP, NodeJS and JS) and 2 have problems (PHP and NodeJS), my JavaScript test run since 1 day without problems.

The code is very simple:

var connection = new autobahn.Connection({url: 'wss://api.poloniex.com', realm: 'realm1'});

connection.onopen = function (session) {
   function onevent(args) {
      console.log("Message:", args[3]);
   }
   session.subscribe('trollbox', onevent);
};

connection.open();

I have tested with Supervisor for NodeJS and same problem, after 1-2 hours, no response, no error, just not receive message anymore.

I'm new to websocket so I imagine I can test more but the fact that all works in Javascript confused me.

Didn't find a solution so I have implemented my proper "ping". I unsubscribe and subscribe every X minutes (my test run since 1 day with 5 minutes interval). No more deconnection and no missed message from the trollbox.

AUTOBAHN_DEBUG = true;

var autobahn = require('autobahn');

(function trollbox() {

  console.log("\n------------- OPEN CONNECTION ---------------\n");
  var connection = new autobahn.Connection({
    url: 'wss://api.poloniex.com',
    realm: 'realm1',
    max_retries: -1
  });

  connection.onopen = function (session) {
    function onevent (args) {

      // Do somethings...
      console.log(args[3]);
    }
    session.subscribe('trollbox', onevent);

    setTimeout(function () {
      console.log("\n------------- CLOSING CONNECTION ---------------\n");
      connection.close();
    }, 300000);

  };

  connection.open();

  setTimeout(trollbox, 300200);
})();