nrf51822 pwm working some minutes will loss.

Question

APP_PWM_INSTANCE(PWM1,1); 


void PWM_init(void)
{
 u32 err_code;

 app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(1000, 8); 
	
 err_code = app_pwm_init(&PWM1,&pwm1_cfg,NULL);
 APP_ERROR_CHECK(err_code);
 app_pwm_enable(&PWM1);
 while (app_pwm_channel_duty_set(&PWM1, 0, 0) == NRF_ERROR_BUSY); 
}


void PWM_Set( u8 duty )
{
 if ( duty>100 ) duty = 100;
	
 while (app_pwm_channel_duty_set(&PWM1, 0, duty) == NRF_ERROR_BUSY);
}
 
 hi,anybody! I have a issue When a device receives the bluetooth data will set the function PWM_Set() , duty take any value.