Ringer volume keeps changing

Hello MilliVanilli,

We understand your ringer volume is dropping unexpectedly, so we want to help with that.

Please make sure you are following the steps in this article about setting your alert volume separately: How to put your iPhone on vibrate, ring, or silent mode

Specifically these steps: " Change ringtone and alert volume with buttons

If you want to control your ringtone and alert volume separately from other apps, turn off Change with Buttons. Then you need to manually adjust your ringtone and alert volume in Settings > Sounds & Haptics or Settings > Sounds."

We hope this helps.

Have a great day.