LM3S9B96_USB_FAULT_ISR

                                                                     
                                                                     
                                             
Hi all,

I am using stellaris LM3S9B96 micrcontroller for my project. Using my own board and CCSV4.2.4.00033 .Power to my board is supplied through USB.

 I am using the USB for my project. I am able to handle USB EP0 traffic during enumeration and USB EP1 during data transfer. 

Problem is first my code runs perfectly and obtaining its functionality. When i remove USB B cable from the board and reconnect and running the code then FAULT ISR occurs.

Temperoryly i am overcoming this issue by running usb_dev_mouse example given in stellarisware before dumping my code. I am handling only USB EP0 AND USB EP1 interrupts. How to handle the power disconnect or handle disconnect 
issues. My handler is as follows.
void
USB0DeviceIntHandler(void)
{
	 //USBIntDisable(USB0_BASE,USB_INT_ALL);

  unsigned long ulStatus;

     unsigned long ulStatusControl;

     unsigned long * ptr;

    	//EP0 STARTING ADDRESS

     ulStatus = USBIntStatus(USB0_BASE);
     switch (ulStatus)

     {
    	 case  USB_INT_EP0:
     	ptr=0x40050020;//Ep0 fifo starting address
     	data[0] =*ptr;
     	data[1] =*ptr;
     	EndPoint0Handler();
     	break;
    	 case  USB_INT_DEV_IN_EP1:
    		   EndPoint1InHandler();
     	break;
     	case  USB_INT_DEV_OUT_EP1:   	
     	      EndPoint1OutHandler();
     	break; 
 	}
 
 }
Please help me on this.

Thanks & Regards,
Mah Kon