This iPhone bug is particularly alarming
Briefly

A post on Reddit revealed a trend of iPhone users experiencing alarm failures, with alarms going off hours late, leading many to seek alternative waking methods.
Numerous reports from users suggest that iPhone alarm bugs date back to at least iOS 9, causing frustration among users who rely on their alarms for timely wake-ups.
A commentator proposed a potential technical reason for the alarm glitches, noting that the issue may arise when iPhones in standby mode believe the user's face is visible.
Disabling the Attention Aware feature may resolve these alarm issues, as suggested by users who found their alarms became more reliable when their phones were facedown.
Read at ZDNET
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