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Flash FDS initialization failure

When the nRF52 micro-controller is programmed through batch file i.e. nrfjprog utility, the flash fds fails to initialize. Every time, flash fds initialization fails, I have code for soft_Reset.

Initialization fails 3 times and then Flash FDS initializes with success.

After a bit of debugging, I found out fds_register(flash_fds_evt_handler) returns with Success. fds_init() returns with Success.

But the flash_fds_evt_handler() never gets called in the first 3 attempts.

Any insight will be helpful.

I have attached the code snippet below. I am using nRF52932 microcontroller, SDK12.2.0, softdevice s132 v3.0.0

ble_stack_init();

// fds must be initialized after the Softdevice, as it uses the system event to run
flash_fds_init();           
// must wait for fds to initializ
while(!fds_init_complete)   
{
    power_led_red_on();
    nrf_delay_ms(1000);
    NVIC_SystemReset();
}
// use fds to get the auth params (first time though, this Writes the default auth params) 
load_auth_params();
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