Audio Problem Oculus Go

We have an audio problem in Unity / Oculus GO. We
build an simple APK with only oculus essentials and then sideload it
with ADB to the Oculus GO

Packages used:

- Oculus Sample Framework

- Oculus Integration

We have the problem that the audio is gone after rebooting our app.
When we press the volume buttons/home button the audio comes back.
(Including the audio interface..)