Arduino Nano v3 (sainsmart) stürzt ab ohne Serial Monitor

Kann man nicht ausschließen, aber wie kann ein aktiver Serial Monitor dazu führen, dass es keinen Absturz gibt?

Hier ist der Sketch:

#include <RF24Network.h>
#include <RF24.h>
#include <SPI.h>
#include <dht.h>
#include "MyTypes.h"
#include <Narcoleptic.h>

#define DHTPIN 3     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)

DHT dht(DHTPIN, DHTTYPE);

// nRF24L01(+) radio attached 
RF24 radio(9,10);

// Network uses that radio
RF24Network network(radio);

// Address of our node
const uint16_t this_node = 1;

// Address of the other node (by default send it to the base)
const uint16_t other_node = 0;

// How often to send 'hello world to the other unit
unsigned long interval = 5000; //ms

// When did we last send?
unsigned long last_sent;

// How many have we sent already
unsigned long packets_sent;

payload_t myData;

// Number of packets we've failed to send since we last sent one
// successfully
uint16_t lost_packets = 0;

void setup(void)
{
  Serial.begin(57600);
  Serial.println("RF24Network/examples/helloworld_tx/");
 
  SPI.begin();
  radio.begin();
  network.begin(/*channel*/ 90, /*node address*/ this_node);
  dht.begin();
      
  RF24NetworkHeader header(network.parent(), 'k');
  Serial.print("APP Sending type: k to node:");
  Serial.println(header.to_node);
  if ( ! network.write(header, NULL, 0) )
     Serial.println("failed.");
}

void loop(void)
{
  delay(100);
  
  // Pump the network regularly
  network.update();
  
   // If so, grab it and print it out
    RF24NetworkHeader header;
    network.peek(header);
     
  
  if ( this_node > 0 )
  {        
    
    float h = dht.readHumidity();
    float t = dht.readTemperature();
    if (isnan(h) || isnan(t)) {
      Serial.println("Failed to read from DHT");
    } 
    else{
       myData.value = h;
       myData.unity[0] = '%';
       myData.lost_packets = lost_packets;
        
       sendData(&myData);      
     
       delay(200);    
     
       myData.value = t;
       myData.unity[0] = 'C';
       myData.lost_packets = lost_packets;
        
       sendData(&myData);   
    }  

    
    //radio.powerDown();
    
    //radio.powerDown();    
  
  }            
}

boolean sendData(payload_t* data) {
  unsigned long now = millis();
  if ( now - last_sent >= interval  )
  {
    Serial.println("Sending...");
    last_sent = now;
    
    boolean ok = false;
  
    RF24NetworkHeader header(other_node, 'S');
    ok = network.write(header, &myData, sizeof(myData));
    if (!ok) {
      ++lost_packets;
      Serial.println("failed.");      
    }
  
    return ok;
  }
  
}