CC2541做BLE从机，进入PM3后，P1及P2中断唤醒后有执行sleep后的操作，但马上死机

#pragma vector = P1INT_VECTOR
__interrupt void port1_isr(void)
{
    // Note that the order in which the following flags are cleared is important.

    // Clear Port 1 Interrupt Flags.
    P1IFG = 0x00;

    // Clear CPU Interrupt Flag for P1 (IRCON.P1IF = 0).
    P1IF = 0;
    PCON = 0;
}
#pragma vector = P2INT_VECTOR
__interrupt void port2_isr(void)
{
    // Note that the order in which the following flags are cleared is important.

    // Clear Port 2 Interrupt Flags.
    P2IFG = 0x00;

    // Clear CPU Interrupt Flag for P2 (IRCON.P2IF = 0).
    P2IF = 0;
    PCON = 0;
}

...
50ms周期处理中
     // 保护中断设置
     IEN0BAK = IEN0;
     IEN1BAK = IEN1;
     IEN2BAK = IEN2;
          EA = 0;
          // P1及P2中断设置
          P2IEN = 0xff;
          P1IEN = 0xff;

     HAL_BG = BACK_LIGHT_OFF; // LED 关

     IEN0 = 0;
     IEN1 = 0;
     IEN2 = 0x12;  // P1、P2中断使能

          EA = 1;
         

          /***************************************************************************
           */
         
          // Set power mode, PM3.
          SLEEPCMD = (SLEEPCMD & ~SLEEPCMD_MODE) | SLEEPCMD_MODE_PM3;

          // Force the device to enter the power mode set by SLEEPCMD.MODE.
          EnterSleepModeProcessInterruptsOnWakeup();

          EA = 0；
          CLKCONCMD &= ~0x40; // 设置系统时钟源为 32MHZ晶振
          while(CLKCONSTA & 0x40); // 等待晶振稳定

          // 关P2、P1中断
          P2IEN = 0;
          P1IEN = 0;

     HAL_BG = BACK_LIGHT_ON; // LED 开

     // 恢复中断设置
     IEN2 = IEN2BAK;
     IEN1 = IEN1BAK;
     IEN0 = IEN0BAK;

进入PM3后，LED灭，这时按键（P1、P2）后，LED亮，但程序马上死机，按键操作无反应，查32MHz晶振有信号

不清除其它中断则进入SLEEP后马上又醒了，这个情况下是不会死机，按键操作正常。是否BLE中断造成的呢？

PM1方式唤醒后操作正常，似乎与Voltage Regulator的关闭有关，TI的工程师能解释下吗？