my alarm doesn't always ring. It started on monday of this week. I use it for school and it did not wake me up. Luckily i woke up a few minutes after it should have rang. This morning it did the same thing. To be on the safe side i set 3 samsung alarms and i also downloaded another alarm app to make sure it rings, but 0 out of 4 rang this morning.
What could this be?
Read more: Samsung Galaxy S4 Alarm Clock wont ring?