Node app consumes more and more memory

Why does this structure makes the app consuming more and more memory? And how do i prevent it? It runs on Windows...

this.connectClient is only called ONCE. connectClient() is called as you can see recursively.

this.connectClient = function() {

        connectClient();

        function connectClient() {

                _ws.on('open', function open() {

                    ...
                });

                _ws.on('message', function (data, flags) {

                   ...
                });

                _ws.on('close', function close() {
                    ...
                });

                _ws.on('error', function error(err) {
                    setTimeout(function(){
                        _ws = new WebSocket('ws://localhost:4080');
                        setImmediate(connectClient);
                        // or just connectClient(); makes no difference

                    }, 5000);
                });
        }
    }

via PabloDK