Sorry folks, but I’m going to disagree with a couple of comments.
Certainly, paphs have “crowns” - that is the apical meristem / growth front of the shoot - and “crown rot” is certainly possible if water stands in there, but there are other means a pathogen can be introduced, such as insects.
I agree that the plant should stay constantly moist. Most of the time, underwatering leads to the drying out of the oldest, lower leaves first, but like everything else “orchids”, that’s not 100%.
Lastly, while it may be common, the yellowing and loss of previously bloomed growths is an indication that the culture is a bit lacking. A well-grown Paph will maintain its growths for years, with the old ones continuing to generate and store the phytochemical resources the colony shares.
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