"Ringer and alerts" volume changes even though "Change with Buttons" is off
I have always had the "Change with buttons" option turned off on my iPhone for controlling the volume of my ringer and alerts.
About a month ago, the ringer/alert volume seemed to set itself to almost silent. (Note: not completely silent.) It caused me to miss a number of calls and messages. I had to go into the Settings app to set it back to an audible level.
This afternoon, the ringer/alert volume set itself to almost maximum volume. I was in a Zoom meeting and received a phone call... the ringtone was comically loud, and embarrassing. I had to go back to the Settings app and reset the volume to a reasonable level.
Question: If my "Ringer and alerts" volume can't be changed with the buttons, then how is it getting changed, and how can I stop these changes? This is ridiculous.