Alarm is now unreliable

Ive used this app for years. I could always trust it to do what it is meant to do. No longer true - some mornings Ill wake up late, look at the phone and see that the alarm shows as having gone on. But there is no sound. I guess it has something to do with a recent update. It should have been tested more thoroughly. Ill have to find another app.

Harlison about Alarm Clock Pro, v1.13.1