A few times over the last couple of weeks, since getting my iPhone 6, I've noticed my alarm clock hasn't been sounding like it should. I sleep with my phone in do not disturb mode, but this was never a problem on iOS 7. In the morning, when I go into alarms, they're turned off as if they had sounded, but they never did. I tried deleting all of my old alarms and setting them again, but this only helped for one day; this morning, none of them went off. Is anyone else having this problem? Any possible solutions? Thanks in advance!