MSP430F6779A SVMHIFG interrupt fires on power up

Hello Jesse Frey (1474738)  and Cameron LaFollette (3712600) ,

I am also facing related problem, My PMM configuration is

 PMMCTL0_H=PMMPW_H;
          PMMCTL0_L|=PMMCOREV_3;
          //check voltage level
          switch(PMMCTL0&PMMCOREV_3)
          {
            //settings for highest core voltage settings
            case PMMCOREV_3:
              //setup high side supervisor and monitor
              SVSMHCTL=SVMHE|SVSHE|SVSHRVL_3|SVSMHRRL_7;
            break;
          }
          //clear interrupt flags
          PMMIFG&=~(SVMLIFG|SVMHIFG|SVMHVLRIFG|SVMLVLRIFG);
          //setup interrupts
          PMMRIE|=SVMLIE|SVMHIE|SVMHVLRIE|SVMLVLRIE;
          //lock PMM
          PMMCTL0_H=0;

and 

My ISR is 

#pragma vector = SYSNMI_VECTOR
__interrupt void SYS_NMI(void)
{
  switch(SYSSNIV)
  	  {
		case SYSSNIV_SVMLIFG:
		break;
		case SYSSNIV_SVMHIFG:
			 write_SegC();     //Funtion to be called
		break;
		case SYSSNIV_DLYLIFG:
		break;
		case SYSSNIV_DLYHIFG:
		break;
		case SYSSNIV_VMAIFG:
		break;
	        case SYSSNIV_JMBINIFG:
		break;
		case SYSSNIV_JMBOUTIFG:
		break;
		case SYSSNIV_VLRLIFG:
		  PMMCTL0_H=PMMPW_H;
		  //clear interrupt flags
		  PMMIFG&=~(SVMLIFG|SVMLVLRIFG);
		  //lock PMM
		  PMMCTL0_H=0;
		break;
		case SYSSNIV_VLRHIFG:
		  PMMCTL0_H=PMMPW_H;
		  //clear interrupt flags
		  PMMIFG&=~(SVMHIFG|SVMHVLRIFG);
		  //lock PMM
		  PMMCTL0_H=0;
		break;
  	  }
}

Problem I am facing is I want to go into write_SegC() function while my supply goes down but instead of this it goes into it while I power it up.

Thanks

Regards

Abhishek