My timer finishes as normal but no sound comes from it when the notification alarm sound is on and music has been associated with it. The same happens to the alarm clock. I've watched many YouTube and it tells me to go into notifications, then do not disturb, then apps to clear the data and cache. Still doesn't work. I've powered off and then on & there is sound to the timer and the alarm but that lasts for about an hour or two & then it goes silent again.