Unwanted repeat of container audio

I want to automatically play an audio file when a layout is displayed. I have an audio file in a container field. When I click on it manually it plays once.

I made a simple script with a Go to field/select/perform command. I wanted to use the onlayoutopen script trigger to run the script.

When I run the script, it plays the audio, but repeats it infinitely instead of playing it once, as it does when you click on the field manually.

I have tried a million different ways of exiting the script, but none work. I can add subsequent script steps, which run, but the script seems to lop back and play the audio again.

Any ideas?

Thanks.