Aircraft cabin: some sliders go silent around 20 seconds after starting the generator

In the attached screenshot, I have set several of the sliders to full volume. These sliders do not make any noise at all even at this setting, and this greatly impacts the listening experience of this generator negatively. It works fine initially, but each of the noted sliders gradually fades out to silence, regardless of their volume setting.

My phone is a Xiaomi Redmi 6 (not note). Model name: M1804C3DG Running on Android 8.1.0; MIUI 10.3.3

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