Volume goes down when tracking
If you notice your volume gradually dropping after a while while tracking is running, the Turn off when sleeping is enabled. This feature lowers the system-wide volume, so it also affects music played outside of Sleep.
Go to Settings → Sleep tracking → Lullabies → Turn off when sleeping.
Increase the minimum play time (5-90 minutes).
Or disable the feature altogether by setting it to Disabled, and the app won’t change the volume.
Tags: lullaby, tracking, volume