I will pass your feedback along to my engineering team regarding the auto-adjust volume feature. Just to confirm: Do you have auto-adjust checked in the DPS Window, Settings tab?
It is possible to turn off notifications for Bongiovi DPS in Windows 10 settings.
1.) Go to Notification and action settings (Type: “Notification” into the cortana bar, it will come up.”
2.) Scroll down to Bongiovi DPS and turn the notification slider to the Off position