在连接resualt powerdown外围设备system crash

Dear Dialog,
I try to reduce the power of my system，when the phone connect to the dialog14580，i didn‘t call periph_init() until data transfer ble -> uart, I call user_wakeup_hold_set() and start data transfer, after a time, the timer callback will call to restore_sleep_mode, here the problem coming when device go to sleep, system crash ！！

void user_wakeup_hold_set(void)
{
if (wakeup_hold_timer_used == 0)
{
wakeup_hold_timer_used = app_easy_timer(USER_WAKEUP_HOLD_TIME, wakeup_hold_timer_cb_handler);

periph_init();
arch_force_active_mode();

arch_printf("wake up hold set\n");
}
else
{
wakeup_hold_timer_used = app_easy_timer_modify(wakeup_hold_timer_used, USER_WAKEUP_HOLD_TIME);
arch_printf("wake up hold reset\n");
}
}

static void wakeup_hold_timer_cb_handler(void)
{
arch_restore_sleep_mode();
wakeup_hold_timer_used = 0;
arch_printf("Wake up hold clear\n");
}

i have no idea to figure it out ，please help me，thank you very mush！