Problem: Win 10 auto ejects Mkrzero after pluggin in

Development Libraries
1

Hi,
I've got a strange problem with my Mkrzero.
After I plug it in Win10 is ejecting it directly.

This was my code I wanted to test:

const uint8_t PB09 = 8;

void setup() {
  Serial.begin(9600);

}

void loop() {
	Serial.println("LOOP");
	analogReadTest();
}

void analogReadTest()
{
	int sensorValue = analogRead(PB09);
	float voltage = sensorValue * (5.0 / 1023.0);
	Serial.println(voltage);
}

Did I destroy the board?
Or is there any fix I can do?

Thanks for the help!

2