IRremote sending only works once with Arduino Nano

Question

I am trying to control a receiver, wich is not working. I believe i have to send the code at least three times... but after the first time the IR Led stays off. I am using the Arduino Nano with the LED connected to pin 13. The "Send" message keep printing.

• I am using this lib: https://github.com/Arduino-IRremote/Arduino-IRremote
• I tried multiple versions of the lib

My code:

#include <IRremote.h>
IRsend irsend;
void setup() {
  Serial.begin(9600);
}
const static unsigned int raw[68] = {8950,4450,550,550,600,550,600,500,600,550,550,550,600,500,600,550,600,500,600,1600,600,1600,600,1650,550,1650,550,550,600,1600,600,1600,600,1650,550,550,600,1600,600,1600,600,550,550,550,600,500,600,550,550,550,600,1600,600,550,550,550,600,1600,600,1600,600,1600,600,1600,600,1650,550};
void loop() {

  Serial.println("Send");
  for (int i=0; i<3; i++) {
    irsend.sendRaw(raw,68,38);
    delay(40);
  }
  delay(5000);
}

• Works only again once when resetting the Arduino