Let’s look at the conclusion first
When loop playback is not turned on, the AI will not lose its position immediately when it reaches the end of the document, but will continue to monitor for 120 seconds to identify whether you have explicitly read back the current scene or the previous text in the paragraph buffer. Only reliable matches will trigger readback, and ordinary ambient sounds will not extend the waiting time.
Performance under different settings
Notice
If you've determined that you want to re-record from the beginning, it's often clearer to use the Return to the Beginning of the Document button; don't rely on continually making sounds to maintain the end.