Default Issue with Audio Manager Pro Losing Notification Tone

Anyone else experiencing problems with Audio Manager Pro? I found that my notification ringtone would randomly reset itself to "Unknown RIngtone." Thinking it might be Zedge, I deleted the app and the folder with the ringtones. Still no joy.

It turns out that each time one of the Audio Manager profiles was changed per the schedule, it would change the ringtone. I deleted Audio Manager Pro and everything is now working OK.