Was your Bangle in water recently? It seems like me and someone else have an issue where the MCU thinks the button is constantly pressed because of water intrusion.
Now that it you mention it, yes, it actually was. I did not mention it because I didn't think it was related, because the Bangle was in water several times before and it was fine. But maybe an hour before the problem began it was in water. The thread you've linked makes me think it could be the same problem. That's very unfortunate as there seems to be no universally working solution currently.
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