To reproduce:

1. Install and open the Google Play Games app
2. Tap one of the games (it doesn't matter which). If you have no games on the device, install one (e.g. Fallout Shelter)
3. On the next screen, there should be a camera icon for game recording and streaming to YouTube. Tap it
4. Tap 720P HD and Launch
5. You should now have the YouTube recording UI onscreen. Hit the home button to exit the game. The YouTube recording UI should still be onscreen
6. Download attached project "sapp.zip" and open in Unity
7. Open "main" scene
8. Create Empty gameObject in Hierarchy and add "Movement-Proposition.mp3" file to it
9. Set Android platform
10. Build and run the project on an Android device
11. After you hear the music playing, tap the YouTube recording UI and tap record
13. After a 3 second countdown, the Unity app will freeze for a short while and sound will cut out

Notes:
- Logcat is shared in the comments section
- This issue is reproducible only on Android devices

Reproduced on Devices:

Asset tag Device name OS version CPU SoC GPU renderer GLES version Serial number

VLNQA00093 Samsung Galaxy S6 Edge 7.0 Exynos 7 Octa 7420 Mali-T760 OpenGL ES 3.2 05157df580154b28
VLNQA00134 Samsung Galaxy S8 8.0.0 Exynos 9 Octa 8895 Mali-G71 OpenGL ES 3.2 ce031713e36b302a0c
VLNQA00091 Google Pixel 2 XL 9 Snapdragon 835 MSM8998 Adreno (TM) 540 OpenGL ES 3.2 710KPZK0465061

Reproduced on Unity 2017.2.3p4, 2017.3.2f1, 2017.4.11f1, 2018.1.9f2, 2018.2.9f1, 2018.3.0b3 and 2019.1.0a2