My right nothing ear 2 was noticeably lower in volume and squeaky clean since they are quite new. I use Personalized ANC and the Sound Personalization pretty much at all times, so I took the approach of a software ‘reset’… I turned off all the in app features, deleted my Hearing Test then Forgot the Device in the app and in my phone’s bluetooth connectivity. I deleted the app and stored data and closed the case to ‘power off’ the nothing ear 2. I reinstalled the app, reconnected the device to my phone then to the app and WALA! Worked for my specific situation. Good Luck! 👍🏼