Ringer Volume

This is part of the Attention Aware Feature of the iPhone. When the iPhone has your attention while you are looking at the screen (typing, reading websites or working with an app), then it automatically reduces the sound because it knows you are looking right at it so no need to issue loud notifications.

You can turn this feature off if you want by opening Settings ➔ Accessibility ➔ Face ID & Attention ➔ Attention Aware Feature set this to OFF.

Axel F.

Open Settings ➔ Sounds & Haptics ➔ Ringer and Alerts: Slide the volume to the level that you prefer to hear the ringer and the alerts. Set Change with Buttons to OFF.

Axel F.

You are welcome.

Axel F.

I have a similar problem. My ringer volume goes to zero and I have no idea what causes it. My change with buttons switch has always been off.