Hi everyone 
I am conducting an online experiment on Pavlovia involving 18 trials where an audio file (currently .wav, but also tried .mp3) and a video file (.mp4, with muted audio) play simultaneously. Locally (PsychoPy 2024.1.3), it worked perfectly. I then piloted the online study on Pavlovia using all laptops (and browsers) at my disposal without complications. However, when I started data collection, around a third of all participants reported that the audio stopped working mid-way through the trials while the videos kept playing without problems. 
This never occurred right at the beginning, but at some point during the experiment (the earliest occurrence was in the 3rd trial, the latest in the 17th trial). So far, I did not find any systematic patterns: it happens in different browsers and for different operating systems. It also does not seem to be linked to a specific audio or video file nor to a specific trial or point in the experiment.
What I have already tried without success:
- Changing the audio file type (wav, mp3) and sample rate
- Assigning the video/audio for each trial via a csv-file vs. in code
- Changing the timing of audio and video playback
- Starting the audio in a routine before the video (and keeping it playing throughout the video routine)
I am pretty desperate at this point, especially since I cannot reproduce the error on my own laptop and am dependent on feedback by participants… And unfortunately, I cannot merge the video and audio into one file in advance because they are combined differently for each participant.
Therefore, I would be immensely grateful for any suggestions of what the problem might be and what I can do to fix it. Thank you so much in advance!