I believe they definitely have "bad days" as well as good days, moods, emotions, all of that! Cats are so sensitive! Have you ever seen your cat noticing things you would swear aren't there? They pick up on all sorts of energy and influences and it stands to reason they would respond.
And also of course it could easily be a physical cause such as eating something that disagrees, or even a small injury you don't notice, so it's a good idea, if you can, to check those possibilities too.
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