Cattleyas also may turn purple after exposure to cold. Have you had recent cold spells? Would this piece be less protected from cold than the others?
They don't need much water when not actively growing and temperatures are cooler. Your humidity is probably quite high most of the year. There is the possibility of fungus invading after bugs take bites, so it could be useful to draw rings around the spots you see with a marker to see whether they are expanding. My guess is they won't.
You will see lots of online videos scaring people about fusarium, which is supposed to cause purple rings in the rhizome. Fusarium is a disease of high temperatures and high humidity. I doubt your plant has that.
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