For all we know, he could have been sitting on the loo without taking a nature action. The loo is a mysterious place!That's a rather personal question don't you think K? I mean, what if he was in the loo taking a nature action when this occurred!
If it's only concurring at night, it may be caused by the server maintenance. Do you only see the database error at night?
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Speculation that the error may have coincided with server backup or other cron job?