code architecture problem ( randomly crashing )

In my code i am implementing a state machine , once scheduler is triggered da14580 takes data from sensor, process it, and goes to sleep (waiting for next sensor interrupt to come)
sensor gives interrupt every 20ms , my problem is that this code is randomly crashing , I want to ask is it possible to go into sleep mode between two consecutive samples ( if they are 20ms apart ) .
I am using PAN1740 ( in debug environment)

void WKUP_QUADEC_Handler(void)
{

环境运输及工务局局长ord16(SET_FREEZE_REG, FRZ_WDOG);

NVIC_DisableIRQ(WKUP_QUADEC_IRQn);

SetBits16 (CLK_AMBA_REG PCLK_DIV 0);
SetBits16(CLK_AMBA_REG, HCLK_DIV, 0);

if((GetBits16(CLK_PER_REG, WAKEUPCT_ENABLE) != 0))
{
环境运输及工务局局长ord16(WKUP_RESET_IRQ_REG, 1);
SetBits16(WKUP_CTRL_REG, WKUP_ENABLE_IRQ, 0);
}

if(GetBits16(SYS_STAT_REG, PER_IS_DOWN))
periph_init();

if(app_ble_ext_wakeup_get())
{
app_disable_sleep();
SetBits32(GP_CONTROL_REG, BLE_WAKEUP_REQ, 1);
if( CurrentState == SLEEP)
{
app_ble_ext_wakeup_off();
app_adv_start();
}
}

if(CurrentState == SLEEP && (PastState == COMPUTING || PastState == INITILISATION))
{
set_state(VALIDATION,SLEEP);
}
else if(CurrentState == IDLE && PastState == VALIDATION )
{
set_state(VALIDATION,IDLE);
}
else if(CurrentState == IDLE && PastState == COMPUTING )
{
set_state(COMPUTING,IDLE);
}

GLOBAL_INT_STOP();
flip_main_scheduler(); // For communication with sensor , and data proccessing
GLOBAL_INT_START()

return;
}