Problem with Soft reset on STM32F427ZI Rev 3 silicon

I have a new board that uses the rev 3 silicon and it will not reset under software control. I have an older board design that uses the rev 1 silicon and the software reset logic works properly. The new board design is based on the previous one.

___STATIC_INLINE 
void
NVIC_SystemReset(
void
)
{
__DSB(); 
/* Ensure all outstanding memory accesses included
buffered write are completed before reset */
SCB->AIRCR = ((0x5FA << SCB_AIRCR_VECTKEY_Pos) |
(SCB->AIRCR & SCB_AIRCR_PRIGROUP_Msk) |
SCB_AIRCR_SYSRESETREQ_Msk); 
/* Keep priority group unchanged */
__DSB(); 
/* Ensure completion of memory access */
while
(1); 
/* wait until reset */
}