No longer works with OS13 – Alarm Clock Pro Review

Have been using the app for years and love it to be able to choose my music for each day alarm. However, just upgraded iPhone 7+ to OS13 and I put on the app on the evening as before and somehow, I some point during the night it closes off itself and the alarm won't ring in the morning because the app is on "on". Please fix this bug ASAP (I have already upgraded app to current Rev of course).
Review by Frog in California on Alarm Clock Pro.