Ok, I have the Extreme Alarm Clock app on my S7. Currently the only way I get the alarm to go off, after the phone has be in sleep mode is pressing the power button. Once I do that, the alarm will function fine. I use Agent overnight to help save battery power. What could be causing this, and I have sent an email to Extreme Alarm clock, just waiting to hear back from them too. I don't like the stock clock app, can't use ringtones as alarm sounds.