iphone15 no longer makes audible sound when receiving new emails
My iphone15 used to make audible sounds when receiving new emails. Setting checked and all appears still set properly to make selected sound upon new email. Now does not receive emails when sleeping but only when unlocked and awake. Sometimes upon unlocking selected sound is played but not always. No Do not disturb or focus settings active.
Please advise as everything else works properly - texts, phone, all other notifications
iPhone 15, iOS 18