Police siren slert – samsung s10

A couple of weeks ago out of nowhere what’s best described as a police car siren alert started sounding on my phone for four cycles at a time.

I have since noticed it goes off every 20 minutes exactly, three times an hour, although not every hour of the day.

It’s extremely intrusive but I can turn down the volume.

I have checked every notification setting on every app, gone through every possible system setting but cannot find from where it is originating. I have rebooted, installed the latest system update, all to no avail.

I work in IT so consider myself fairly knowledgeable but this is defeating me. I can find no other reference to this on Internet.

Any ideas, please??

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