I\'m making a volley request in this way:
   public void makeRequest(BaseRequest request, Response.Listener responseListener,
                      
         
NetworkDispatcher has only 4 threads by default so i think your problem is caused by creating multiple requestqueue and old threads dose not killed, use singleton queue, for refering to that look at:
http://developer.android.com/training/volley/requestqueue.html
each request queue has only 4 threads but in your image i can see more than 4 so obviously your problem caused by not using singleton design pattern.