C++, Arduino, LED pulse effect everytime different one

random_pulse_led_effect.ino

int ledPin = 11;
float sinVal;
int ledVal;

void setup(){
    pinMode(ledPin, OUTPUT);
}

void loop(){
  for(int x=0; x<180; x++) {
    if(x == 90){
        digitalWrite(LED_BUILTIN, LOW);
        delay(random(30000));
        digitalWrite(LED_BUILTIN, HIGH);
    } else if(x == 179){
        digitalWrite(LED_BUILTIN, LOW);
        analogWrite(ledPin, LOW);
        delay(random(60000));
        digitalWrite(LED_BUILTIN, HIGH);
    } else {
       sinVal = (sin(x*(3.14159265359/180)));
        ledVal = int(sinVal*255);
        analogWrite(ledPin, ledVal);
        delay(55.333);   
    }
  }
}