Apple confirms bug that is keeping some iPhone alarms from sounding
Briefly

Apple confirms a software bug impacting iPhone alarms; company is working on a fix. Past bugs related to time changes, like Daylight Saving Time, may be the cause.
The current issue with iPhone alarms not sounding may relate to a recent time change; the bug seems to impact some users selectively. Apple's official statement lacks specific details on the cause.
Read at Ars Technica
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