Quite likely this is a bog standard Joe-job (qv).
Thank you for adding both to my vocabulary and to the sum total of my knowledge!
You haven't done anything wrong, and there is nothing you can do about it. They usually run for around 72 hours.
I appreciate your words of consolation, but they sound ominously like my (elderly) family doctor when I was a child, airily dismissing my latest malady as, "Oh don't worry; it's just a virus"!
Thanks to all who have offered advice and comfort so far.