Reproduction steps:
1. Open the user's attached project and Samples/DSPGraph Audio Framework/0.1.0-preview.16/Simple DSPGraph examples/PlayClip/PlayClip scene
2. In the Hierarchy window, select PlayClip GameObject
3. In the Inspector, right-click on the Play Clip (Script) component and select Play Sound
4. Listen to the audio for up to ~60 seconds

Expected result: Audio is played
Actual result: Audio stops after ~60 seconds from the last time the Editor mode was entered

Reproducible with: 0.1.0-preview.13 - 0.1.0-preview.17 (2020.2.2f1, 2020.2.3f1, 2021.1.0b5, 2021.2.0a4)
Not reproducible with: 0.1.0-preview.13 (2019.4.20f1, 2020.2.1f1)
Could not test with: 2018.4.31f1 (could not downgrade)

Notes:
1. The 60 seconds starts ticking when Editor mode is started, not when Audio is started playing
2. When Play Sound is pressed after the Audio stops, the Audio will not be played
3. The Audio will be played for 60 seconds again, after entering the Play mode