Void Loop not looping

so have been messing around robot arm , have been making random tasks. realised void loop() not looping. ideas why?

code: [select]

#include <servo.h>

servo servo1;
servo servo2;
servo servo3;
servo servo4;

int pos1 = 0;
int pos2 = 0;
int pos3 = 0;
int pos4 = 0;

void setup() {
  // put setup code here, run once:
servo1.attach(3);
servo2.attach(5);
servo3.attach(6);
servo4.attach(9);
}

void loop() {
  // put main code here, run repeatedly:
/*for(pos1 = 0; pos1 < 20; pos1 += 1) {
  servo3.write(pos1);
  delay(15);
};*/
servo3.write(80);
delay(500);
servo4.write(70);
delay(500);
servo1.write(160);
delay(500);
servo2.write(40);
delay(1000);
}



apologies if problem happens fault

what makes think wonder?

i put serial.println() in setup() , loop() , got output show is looping.

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