Why does my alarm randomly mute itself? Even when I’m in another room.

You may try some of these steps, please chack after each step....

1. Sometimes, a simple restart can resolve temporary software glitches. Turn off your iPhone, wait for a few seconds, and then turn it back on.
   1. Restart the device. That's it.
   2. Still not solved --> Force restart iPhone - Apple Support
2. If the issue persists, you can try resetting all settings on your iPhone. This will not erase your data but will reset all personalized settings to their default values. Go to Settings > General > Transfer & Reset > Reset > Reset All Settings and confirm the action. Note that you will need to reconfigure your settings afterward. All settings—including network settings, the keyboard dictionary, the Home screen layout, location settings, privacy settings, and Apple Pay cards—are removed or reset to their defaults. No data or media are deleted.
   1. Reset All Settings: Return iPhone settings to their defaults - Apple Support:- Return iPhone settings to their defaults
   2. You can return settings to their defaults without erasing your content.
   3. If you want to save your settings, back up your iPhone before returning them to their defaults. For example, if you’re trying to solve a problem but returning settings to their defaults doesn’t help, you might want to restore your previous settings from a backup.
3. It's possible that your iPhone was scheduled to triggered the Do Not Disturb mode around the same time as the bed time alarm, which can silence incoming calls and notifications, including alarms. To check if this is the case, swipe down from the top-right corner of the screen (on iPhone X or later) or swipe up from the bottom of the screen (on earlier iPhone models) to access the Control Center. If the crescent moon icon is lit up, Do Not Disturb mode is enabled. Tap the icon to disable it. Turn on or schedule a Focus on iPhone
4. Make sure you have the latest updates installed.
   1. Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
   2. Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)

If none of the above steps resolve the issue, it is recommended to reach out to Apple Support or visit an authorized service center for further assistance. They can provide specific guidance based on your device model and iOS version.

I’ve had this happen as well. Late for work twice now! Since the last update. Luckily my manager knows I’m never late, but did miss a meeting.

This morning I witnessed it as I was awake. Alarm sounded a couple of times and went silent.

I do not ever use do not disturb. So that is not the issue.

Please, how do I fix this issue without buying an alarm clock. I’ve used my iPhone for years as an alarm, this is very frustrating.

Did anyone find a solid solution to this?

I have had this issue since my iPhone 12!!! Alarm will go off then suddenly decrease in volume, or just not sound at all. Has made me late to work numerous times over the years! Luckily my place of work is very relaxed