LED turns off auomatically after about 18 seconds on its own? - Arduino Due

i using arduio due , programing atmel studio 6.2. have had huge learning curve using ide , atmel asf. nothing straightforward in arduino ide. none less, want toggle led on , off simple interrupt on pull-up configured tactile button. code:

 

code: [select]

   #include <asf.h>
    #include "pio.h"
   
    // define led pins
    #define blue_led2 pio_pc28 // arduino due pin 3
    #define blue_led3 pio_pc26 // arduino due pin 4
    #define blue_led4 pio_pc25 // arduino due pin 5
    #define blue_led5 pio_pc24 // arduino due pin 6
    #define blue_led6 pio_pc23 // arduino due pin 7
   
    // define button pins
    #define button_1 pio_pc22
    #define button_2 pio_pc21
   
    // define function prototype button interrupt
    void button_press_handler(uint32_t, uint32_t);
    void toggle_led(uint32_t);
   
   
    int main (void)
    {
    /* initialize sam system. */
    sysclk_init();
   
    // initialize input/out
    ioport_init();
    pmc_enable_periph_clk(id_pioc);
    pmc_enable_periph_clk(id_piob);
   
   
    // set led pins outputs , set there default values (off)
    pio_set_output(pioc, blue_led2, low, disable, enable);
    pio_set_output(pioc, blue_led3, low, disable, enable);
    pio_set_output(pioc, blue_led4, low, disable, enable);
    pio_set_output(pioc, blue_led5, low, disable, enable);
    pio_set_output(pioc, blue_led6, low, disable, enable);
   
    // set button pins pull-up inputs
    pio_set_input(pioc, button_1, pio_pullup);
    pio_set_input(pioc, button_2, pio_pullup);
   
    // configure button input pin interrupt mode , handler (falling edge)
    pio_handler_set(pioc, id_pioc, button_1,  pio_it_rise_edge, button_press_handler);
    pio_handler_set(pioc, id_pioc, button_2,  pio_it_rise_edge, button_press_handler);
   
    // enable interrupts
    pio_enable_interrupt(pioc, button_1);
    pio_enable_interrupt(pioc, button_2);
    nvic_enableirq(pioc_irqn);
   
    while(1){
    // doing stuff in here...
    }
   
    }
   
then interrupt routine:

code: [select]

    // interrupt handler button press
    void button_press_handler(uint32_t a, uint32_t b)
    {
    // turn led's on or off
    toggle_led(blue_led2);
    toggle_led(blue_led3);
    toggle_led(blue_led4);
    toggle_led(blue_led5);
    toggle_led(blue_led6);
    }
   
    // function toggle led on/off
    void toggle_led(uint32_t led){
   
    if (pio_get(pioc, pio_type_pio_output_0, led))
    pio_clear(pioc, led);
    else
    pio_set(pioc, led);
    }


things work normal , expected until 18 seconds in. after 18 seconds, led turns off if on. tested setting led 2 high default , removing interrupt together:

 pio_set_output(pioc, blue_led2, high, disable, enable);

in case, led stay on forever, every 18 seconds, led flash off on once quickly. why happening? 

anyone?

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