Unstoppable random beeping, Samsung A52

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Android Central Question

Last night around midnight, my A52, which was on the charger, started beeping approx 1/sec. After a minute or two, it started beeping rapidly, approx 2/sec. I unplugged the phone, closed all apps but it kept beeping. The only way I could get it to stop was to hold the side button and reboot. Notification settings are all OK.
Any ideas why this happened and how to prevent it?