Stuck in While loop when case is activated. Arduino

I have an arduino uno that controls a light using an ir remote. The sketch works fine until I pressed button c which is case 0x10EF58A7. This case reads in values and dims the light accordingly but the only problem is i can not exit the case when another button on the ir remote is pressed! what should i do!?

#include <SoftwareSerial.h>

#include <boarddefs.h>
#include <IRremote.h>
#include <IRremoteInt.h>
#include <ir_Lego_PF_BitStreamEncoder.h>

#include <TimerOne.h>   

int RECV_PIN = 13;

IRrecv irrecv(RECV_PIN);
decode_results results;
volatile int i=0;               // Variable to use as a counter
volatile boolean zero_cross=0;  // Boolean to store a "switch" to tell us if we have crossed zero
int AC_pin = 7;   
int dim2 = 0;                   // led control
int dim = 128;                  // Dimming level (0-128)  0 = on, 128 = 0ff
int pas = 8;                   // step for count;

int freqStep = 65;
char incomingByte;

void setup() {                
  Serial.begin(9600);
  // initialize the digital pin as an output.
  pinMode(RECV_PIN, INPUT);  
  pinMode(AC_pin, OUTPUT);
  irrecv.enableIRIn(); // Start the receiver
  attachInterrupt(0, zero_cross_detect, RISING);    // Attach an Interupt to Pin 2 (interupt 0) for Zero Cross Detection
  pinMode(AC_pin, OUTPUT);
  Timer1.initialize(freqStep);                      // Initialize TimerOne library for the freq we need
  Timer1.attachInterrupt(dim_check, freqStep);      
  // Use the TimerOne Library to attach an interrupt
}

void zero_cross_detect() {    
  zero_cross = true;               // set the boolean to true to tell our dimming function that a zero cross has occured
  i=0;
  digitalWrite(AC_pin, LOW);
}                                 

// Turn on the TRIAC at the appropriate time
void dim_check() {                   
  if(zero_cross == true) {              
    if(i>=dim) {                     
      digitalWrite(AC_pin, HIGH);  // turn on light       
      i=0;  // reset time step counter                         
      zero_cross=false;    // reset zero cross detection
    } 
    else {
      i++;  // increment time step counter                     
    }                                
  }    
}  

 void translateIR() // takes action based on IR code received 
{

  switch(results.value){

  case 0x10EFD827: 
  //power button 
   dim = 00;
    Serial.println(" full brightness "); 
    break;
  case 0x10EF20DF: 
  //circle button 
  dim = 128;
    Serial.println("off   "); 
    break;
  case 0x10EFF807: 
  // button A
  dim = 95;
    Serial.println(" dim level 1   "); 
    break;

   case 0x10EF7887: 
   //button B
   dim = 50; 
    Serial.println("dim level 2     "); 
    break;

 case 0x10EF58A7:
 // button C 
 {
  while ( Serial.available() > 0) {
 unsigned int num = Serial.parseInt();
 num = map(num, 0, 255, 0, 128);
 unsigned int num1 = map(num, 0, 128, 128, 0);
// num1 = constrain( num1, 0,128);
 dim = num1 ;
   Serial.print(" auto   ");
   Serial.println(dim); 

   delay(800);
   Serial.flush();
    //break;
   }
  break;
}
 break;   

  case 0x10EF10EF:
//button left
    {
    if (dim<127)  
   {
    dim = dim + pas;
    if (dim>127) 
    {
     dim=128;
    }
    }
    }
    Serial.print(" dimming ammount=   " ); 
    Serial.println(dim);
    break;

  case 0x10EF807F:  

  //button right
   {
      {
  if (dim>5)  
  {
     dim = dim - pas;
  if (dim<0) 
    {
      dim=0;  // in vechiul sketch era 1
    }
   }
   }
   }
     Serial.print(" dimming ammount=   "); 
      Serial.println(dim);
    break;

   default: 
    //Serial.print(" unknown button   ");
    //Serial.println(results.value, HEX);
{}
  }

}

void loop(){
  int i=0;
   if (irrecv.decode(&results)) {

   translateIR();
        irrecv.resume(); // Receive the next value

   } 
     delay(700);  
 }