I use an Arduino UNO r3 via USB port attached to a PC running WIN 10 and Python. The Arduino converts the status of an attached analog switch (status open or closed) to binary code to the Python script. Everything works fine, however after some time (hours or even days) the python script gets no data anymore from the Arduino. The Arduino sketch looks like this:

#include <avr/wdt.h>  // Include watchdog library

#define ButtonPIN 8
#define LED 13

bool oldState;

void setup() {
 Serial.begin(115200);
 pinMode(ButtonPIN, INPUT_PULLUP);
 pinMode(LED, OUTPUT);
 bool state = digitalRead(ButtonPIN);
 sendMessage(state);
 oldState = state;
 Serial.println("Setup complete");
 delay(1000);  // Ensure setup message is sent before entering the loop
 wdt_enable(WDTO_8S);  // Enable watchdog timer with an 8-second timeout
}

void loop() {
wdt_reset();  // Reset the watchdog timer

bool state = digitalRead(ButtonPIN);
 if (oldState != state) {
  digitalWrite(LED, state);
  sendMessage(state);
  delay(500);  // Debounce delay
  oldState = state;
 }
}

void sendMessage(bool state) {
 Serial.write(0x01);
 Serial.write(0x29);
 Serial.write(state ? 0x01 : 0x00);
 Serial.write(0xEE);
 Serial.write('n');
}

How can i debug this? In the serial monitor of the Arduino IDE things are looking correct, just in python the switcg stos working at some point. I already checked hardware connection, OS sleep modus, bios setting for USB ports, etc.
I can also trigger the failure by toggling the hardware switch many, many time realy fast. The adurino seems to stop cumminication. If i press the hardware reset button all is back to normal.