Intermittent rsvd_ISR F28027

Hello, I am getting an intermittent  rsvd_ISR caught in F2802x_DefaultIsr.c

I have tried many of the solutions from other posts and am unable to resolve this issue. All of My ISRs are declared and serviced, and what really confuses me is how intermittent this problem is. It will appear for 3-5 builds then disappear for a few then be back again.

Any insight as to where to further troubleshoot would be greatly appreciated. 

interrupt void rsvd_ISR(void)      // For test
{
  asm ("      ESTOP0");
  for(;;);
}