If your iPhone alarm has gone quiet, Apple says it's working on a fix
Briefly

Apple is working on a fix for an issue causing some iPhone alarms to trigger silently. Users experiencing this may check settings, like ringtone volume and disabling “Attention Aware Features”.
Some users suggest turning off the “Attention Aware Features” setting as a potential fix for the silent alarm issue caused by inadvertently lowering the alarm volume when looking at the screen.
Apple's response to the silent alarm issue affecting iPhone users is still pending, as reported, and recommendations from tech support include adjusting sound settings and disabling certain features that may affect alarms.
Read at The Verge
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