multiple calls to app_button_init (error code NRFX_ERROR_INVALID_STATE)

Question

Hi 
 
 I'm trying to develop a solution where I have a different button debounce value (i.e. one call, then another call to app_button_init(..)) depending which part of the program the user is currently at. It works fine with just one call to app_button_init(..). 
 
 Snipping away the bulk of the working code, my code looks something like this 
 
 #include "app_button.h"
#include "app_error.h"
#include "app_timer.h"

#define APP_BUTTON_DETECTION_DELAY APP_TIMER_TICKS(200) // Application Mode: 
#define CAL_BUTTON_DETECTION_DELAY APP_TIMER_TICKS(5000) // Calibration Mode: 

static void buttons_init(uint32_t button_delay)
{
 ret_code_t err_code;
 // The array must be static because a pointer to it will be saved in the button handler module.
 static app_button_cfg_t buttons[] = {{PWR_BUTTON, false, BUTTON_PULL, button_event_handler},
 {UNITS_BUTTON, false, BUTTON_PULL, button_event_handler},
 {BT_BUTTON, false, BUTTON_PULL, button_event_handler}};
 err_code = app_button_init(buttons, ARRAY_SIZE(buttons), button_delay);
 APP_ERROR_CHECK(err_code);
}
 
int main (void) {
// do something

 // Set button timeouts for calibration mode use
 buttons_init(CAL_BUTTON_DETECTION_DELAY);
 APP_ERROR_CHECK(app_button_enable()); 
 
// do something

 // Reset button timeouts for application use
 APP_ERROR_CHECK(app_button_disable());
 buttons_init(APP_BUTTON_DETECTION_DELAY); // <== throws error here
 APP_ERROR_CHECK(app_button_enable());
 
// do something

 while (true)
 {
 // do something
 }
}

the code above throws an error at APP_ERROR_CHECK(err_code) with error code NRFX_ERROR_INVALID_STATE from nrfx_gpiote.c

/* Only one GPIOTE channel can be assigned to one physical pin. */
if (pin_in_use_by_gpiote(pin))
{
 err_code = NRFX_ERROR_INVALID_STATE;
} 
 
 Is there away to clear / reset the GPIOTE channel before making another call to app_button_init ? 
 
 thanks