when I power reset, program not run like first i burn in.

#include <stdbool.h>
#include <stdint.h>
#include "driverlib/debug.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/ssi.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"
#include "inc/hw_ints.h"
#include "inc/hw_types.h"
#include "inc/hw_memmap.h"
#include "utils/uartstdio.h"

char *pcChars = "KKKK";
char i;
//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
}
#endif
void
ssiconfigure(void)
{
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
ROM_GPIOPinConfigure(GPIO_PA2_SSI0CLK);
ROM_GPIOPinConfigure(GPIO_PA3_SSI0FSS);
ROM_GPIOPinConfigure(GPIO_PA4_SSI0RX);
ROM_GPIOPinConfigure(GPIO_PA5_SSI0TX);
ROM_GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 |
GPIO_PIN_2);
ROM_SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_2,
SSI_MODE_MASTER, 2000000, 8);
ROM_SSIEnable(SSI0_BASE);
}
main(void)
{
i=2;
//int32_t i32Idx;
ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
//
//configure ssi interface
//
ssiconfigure();
//i32Idx = 0;
while(1)
{
ROM_SSIDataPut(SSI0_BASE, pcChars[i]);
SysCtlDelay(SysCtlClockGet() / 1000);
}

}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

this is a simple program,but my question is when i press restart button or power reset ,

the program will stop, untill  i burn it again that will working. but i really burn it to flash.

why it's not work when i restart ?

I am use "TM4C123G LaunchPad"