MT4 shutting down?

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I'm running an EA with dll protection -- the name of the EA doesn't matter. It connects to a central server for authentication. My problem is the instance of MT4 I'm running it on keeps completely shutting down. I've never experienced this before. Is it possible the dll is causing this or the authentication server is not working properly, disconnecting me and shutting down MT4?

The computer running this is also running other MT4's, and they are all fine. I've never run anything that had the ability to completely shut down MT4. Is this possible? Thanks
 
Close terminal from MQL4-script
//+------------------------------------------------------------------+
//|                                                CloseTerminal.mq4 |
//|                      Copyright © 2006, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"
#include <WinUser32.mqh>
 
//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  {
   int hwnd=WindowHandle(Symbol(),Period());
   int hwnd_parent=0;
//----
   while(!IsStopped())
     {
      hwnd=GetParent(hwnd);
      if(hwnd==0) break;
      hwnd_parent=hwnd;
     }
   if(hwnd_parent!=0)
      PostMessageA(hwnd_parent,WM_CLOSE,0,0);
//----
   return(0);
  }
//+------------------------------------------------------------------+
 
Are you saying this is what's causing my problem, or do I need this to prevent it?

Close terminal from MQL4-script
//+------------------------------------------------------------------+
//|                                                CloseTerminal.mq4 |
//|                      Copyright © 2006, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2006, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"
#include <WinUser32.mqh>
 
//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  {
   int hwnd=WindowHandle(Symbol(),Period());
   int hwnd_parent=0;
//----
   while(!IsStopped())
     {
      hwnd=GetParent(hwnd);
      if(hwnd==0) break;
      hwnd_parent=hwnd;
     }
   if(hwnd_parent!=0)
      PostMessageA(hwnd_parent,WM_CLOSE,0,0);
//----
   return(0);
  }
//+------------------------------------------------------------------+


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