Keynote presenter mode with notes jumps to first slide after a few minutes.

I have a MacBook Air M1 chip, system Tahoe 26.5.2

Using Keynote in the presenter mode where the presenter notes in one window and an extended screen shows the slides the program. after just a few few minutes it jumps back to the first slide, no matter where I am in the presentation, It jumps back to the first slide.

Very inconvenient.

how do I stop the program from jumping back to the first slide?