Yesterday I came here complaining that the volume sliders lag or are unresponsive. Sometimes they just reset downward when trying to turn the volume down. 
 

well….i did the iOS 18 beta update and the lagging (or resetting) volume problem is gone. I can’t believe it. 
 

iOS 18 beta

pro max 15

I’d send you the build but I can’t cut and paste it. If it’s important you you, reach out