Reading from internal SD Card only working once

[VND]

Hi Guy's! I'm a Teensy amature with some Arduino experience.

I'm using the code below to play a sound when a switch is pressed. When te switch is released, the music must stop. This is working great at the moment.
The only problem I encounter is that reading the SD Card only works once - I Keep getting "Unable to access the SD card" untill I disconnect and reconnect my Teensy.
Is this normal behavior? For developing/troubleshooting this is a bit annoying (just clicking the button or reuploading my code doesn't work ).

Also, is there a way to detect if the wav file completed? I Don't want it to start again.

Thank you!

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
#include <Bounce.h>

AudioPlaySdWav           playSdWav1;
AudioOutputI2S           i2s1;
AudioConnection          patchCord1(playSdWav1, 0, i2s1, 0);
AudioConnection          patchCord2(playSdWav1, 1, i2s1, 1);
AudioControlSGTL5000     sgtl5000_1;

const int haakPin = 24;

// Use these with the Teensy 3.5 & 3.6 SD card
#define SDCARD_CS_PIN    BUILTIN_SDCARD
#define SDCARD_MOSI_PIN  11  // not actually used
#define SDCARD_SCK_PIN   13  // not actually used

void setup() {
  Serial.begin(9600);

  // AUDIO CONFIG
  AudioMemory(8);
  sgtl5000_1.enable();
  sgtl5000_1.volume(0.5);
  SPI.setMOSI(SDCARD_MOSI_PIN);
  SPI.setSCK(SDCARD_SCK_PIN);
  if (!(SD.begin(SDCARD_CS_PIN))) {
    while (1) {
      Serial.println("Unable to access the SD card");
      delay(500);
    }
  }

  pinMode(haakPin, INPUT);
  delay(100);
}

void loop() {
 if (digitalRead(haakPin) == LOW) {
    Serial.println("Telefoon opgenomen");
    
    if (playSdWav1.isPlaying() == false) {
      playSdWav1.play("test.WAV");
      delay(25);
    }

  } else {
    Serial.println("Telefoon ligt op de haak.");
    
    if (playSdWav1.isPlaying() == true) {
      playSdWav1.stop();
    }
  }

  delay(500);
}