Microcontroller doesn't wake up sometimes with external pins

Question

Hi, I am using 4 external pins to wakeup the nRF5340 microcontroller when this goes into deep sleep. There are 2 pins from two buttons, one pin from an interrupt of microcontroller and the last one it is the PGOOD pin of a battery charger. 
 The code works most of the time, but sometimes the wakeup doesn't work and the device goes into zombie mode. 
 The code is the following: 
 nrf_gpio_cfg_sense_set(NRF_DT_GPIOS_TO_PSEL(BUTTON1_NODE,gpios),NRF_GPIO_PIN_SENSE_LOW);
 nrf_gpio_cfg_sense_set(NRF_DT_GPIOS_TO_PSEL(BUTTON2_NODE,gpios),NRF_GPIO_PIN_SENSE_LOW);
 nrf_gpio_cfg_sense_set(NRF_DT_GPIOS_TO_PSEL(PGOOD_NODE,gpios),NRF_GPIO_PIN_SENSE_HIGH);

 // Read pins until the default state is correct
 // https://devzone.nordicsemi.com/f/nordic-q-a/88124/using-nfc-pin-p0-10-as-wake-up-pin-in-nrf52833

 // Enter into low-power mode
 // Above we disabled entry to deep sleep based on duration of
 // controlled delay. Here we need to override that, then
 // force entry to deep sleep on any delay.
 pm_state_force(0,&(struct pm_state_info){PM_STATE_SOFT_OFF,0,0});
 // Now we need to go sleep. This will let the idle thread runs and
 // the pm subsystem will use the forced state. To confirm that the
 // forced state is used, lets set the same timeout used previously.
 k_sleep(K_SECONDS(2));

 while(true); 
 Can you give me some suggestion to solve the issue? 
 Best 
 Marco