Using Phidgets the Editor crashes on second play from acces read violation, execption code 0xC0000005

I wrote a script for reading out a phidget. With the data i control a simple ball, whenever i press play it works without a problem. But after quitting the play mode waiting a few sec and pressing start again the editor will crash and give de read violation.

This is thread is probably the cause of the problem.

  //Separate thread to start Phidget connection
     private IEnumerator PhidgetThread()
     {
         try
         {
             ifk_DI = new DigitalInput[8];
             ifk_DO = new DigitalOutput[8];
             ifk_AI = new VoltageInput[8];
 
             for (int i = 0; i < 8; i++)
             {
                 ifk_DI[i] = new DigitalInput();
                 ifk_DI[i].Channel = i;
                 ifk_DI[i].Open(5000);
 
                 ifk_DO[i] = new DigitalOutput();
                 ifk_DO[i].Channel = i;
                 ifk_DO[i].Open(5000);
 
                 ifk_AI[i] = new VoltageInput();
                 ifk_AI[i].Channel = i;
                 ifk_AI[i].Open(5000);
                 ifk_AI[i].DataInterval = 2;
             }
             Debug.Log("Controller is ready for use");
         }
         catch (PhidgetException ex)
         {
             for (int i = 0; i < 8; i++)
             {
                 if (ifk_DI[i] != null || ifk_DO[i] != null || ifk_AI[i] != null)
                 {
                     ifk_DI[i].Close();
                     ifk_DO[i].Close();
                     ifk_AI[i].Close();
                 }    
             }
             Debug.Log("I has errors");
             Debug.LogError(ex.Message);
 
         }
         Debug.Log("Yield break");
         yield break;
     }

the onapplicationquit with the following code to close the channels.

     private void OnApplicationQuit()
     {
         for (int i = 0; i < 8; i++)
         {
             ifk_DI[i].Close();
             ifk_DO[i].Close();
             ifk_AI[i].Close();
         }
  
         Debug.Log("All channels are closed");
       
     }