Two Fixes:

1. client was instantiated twice, but closed once, leading to a ulimit issue
  2. if there was more than one stat to send, client may be closed too soon. it's easier to create a new client for each send.

lib/statsd.js

@@ -45,8 +45,6 @@ Client.prototype.send = function (data, sample_rate) {
         sample_rate = 1;
     }
 
-    var client = dgram.createSocket('udp4');
-
     sampled_data = {};
     if(sample_rate < 1) {
         if (mt.genrand_real2(0,1) <= sample_rate) {
@@ -59,8 +57,8 @@ Client.prototype.send = function (data, sample_rate) {
     else {
         sampled_data=data;
     }
-    var client = dgram.createSocket('udp4');
     for (stat in sampled_data) {
+        var client = dgram.createSocket('udp4');
         send_data = stat+":"+sampled_data[stat];
         send_data = new Buffer(send_data);
         client.send(send_data, 0, send_data.length, self.port, self.host,