Used to work perfectly

Now you cant rely on it at all, because most of the time the alarm goes off with no sound (music). Even when I leave it in Airplane Mode so I wont get any notifications pushing the App to the background, I cant rely on the App. Most important aspect of an alarm clock is that it is reliable. Used to be my go to alarm, but now it is a complete brick. Please fix, please answer mail from customers, and please explain what the problem is.

Wild_Turkey about Alarm Clock Pro, v1.13.1