Wio Terminal play sound get's stuck after playing sound

Hi there,

I have been following this tutorial for receiving messages using MQTT https://www.seeedstudio.com/blog/2021/02/19/build-an-mqtt-intercom-with-wio-terminal-with-code/
but I’m using the RESpeaker shield for playing sound and record audio.

I have an issue that after I receive a message and play a sound clip, the WIO terminal is no longer responsive.

This function in Wirelesscomm.h, is listening for new messages and calls alarm()

void callback(char* topic, byte* payload, unsigned int length) {
  String response, identity;
  if (payload && strcmp(topic,PUBTOPIC) != 0) {
    for (int i = 0; i < length; i++) {
      response += (char)payload[i];
    for (int i = 0; i < (strlen(topic)-9) ; i++) {
      identity += (char)topic[i];
    fadetxt("Message from: " + identity, FSS9, 40, 250, 240, TC_DATUM);
    fadetxt(response, FSS9, 40, 280, 240, TC_DATUM);

This function in Audio.h, plays the sound.

void alarm() {
    if (playSdWav1.isPlaying() == false) {
      Serial.println("Start playing");
      delay(10); // wait for library to parse WAV info'


If I remove playSdWav1.play(“flute.wav”); the code keeps receiving messages and printing Start playing in the serial console. Which tells me that I’m not handling something correctly while the sound is playing.

I can’t seem to be able to upload files as I’m a new user, if full code is necessary I can maybe upload a link in dropbox.