iPhone alarm didn't go off
I use the same alarms on my phone everyday so it isn't a problem with the actual alarm, but sometimes there is no sound from the phone. It displays the normal alarm on the phone screen with the snooze button but there isn't any sound or vibrations. This doesn't happen a lot, but it still happens. Since I use my phone as my only alarm, I am worried that one day this will happen when I have something really important to go to. If anyone has any suggestions about how to fix this it would be greatly appreciated.
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iPhone 6, iOS 12