I installed this app just after iOS 15 was released, which knocked out an app, similar to this one, which I was using. When I installed this app, I discovered, to my chagrin, that it only worked when the app was displaying on the screen. If I went to another app, or if my screen locked, then Big Ben stopped working. Hoping there would be an update to the app, I didn’t delete it. The update came, approximately six months ago, but the same problems persist. I have Notifications turned on—including Sound—for the app, but it isn’t working. I’m running iOS 15.5. What’s the use of having an app that helps you keep track of time if it doesn’t operate in the background?