Threading with UDPClient - Editor Freezing

I'm trying to understand the relationship between Unity and Mono Threads and have found this useful: http://answers.unity3d.com/questions/180243/threading-in-unity.html ,

Now, I'm trying to use a Thread to read from a UDP socket. This works fine the first time I hit play in the editor but upon hitting play a second time, the editor freezes.

Here's a minimal script that you can use to reproduce the issue in an empty scene.

 using UnityEngine;
 using System.Collections;
 
 using System;
 using System.IO;
 using System.Text;
 using System.Net;
 using System.Net.Sockets;
 using System.Threading;
 
 public class UDP_ThreadTest: MonoBehaviour {
     
     Thread receiveThread; 
     UdpClient client; 
  
     // -------------------------------------------------------------------------
     public void Start()
     {
        init(); 
     }
  
     // -------------------------------------------------------------------------
     private void init()
     {
         receiveThread = new Thread(
             new ThreadStart(ReceiveData));
  
         receiveThread.IsBackground = true;
         receiveThread.Start();
  
         print("Start"); 
     }
                 
  // -------------------------------------------------------------------------
     private void ReceiveData() 
     {
        int somePort = 6390;
  
        try {
  
           client = new UdpClient(somePort);
           while (Thread.CurrentThread.IsAlive) 
           {
              // do stuff
           }
  
        } catch(Exception e) {
  
        }        
     } 
     
     // -------------------------------------------------------------------------
     public void OnApplicationQuit()
     {
        // end of application
        if (receiveThread != null)
        { 
           receiveThread.Abort(); 
        }
  
        print("Stop"); 
     }    
 }

Download and change ext to .cs

Just attach it to the camera, hit play, hit stop, and then hit play again. At that point the editor should freeze.

My questions: Why is this causing the editor to freeze and what's the correct thing to do here?