Did you have much rain this year? Rain will sometimes flush the Calcium completely from the medium. Calcium is used when cells are being built, during active growth, and doesn't move through the plant as many other nutrients do, so making certain the supply is steady is important.
I noticed when I went through Calcium deficiency that some Cattleyas were perfectly fine and unaffected while Black rot went through the rest of my collection like a wildfire. This led me to believe that some Cattleyas, based on their ancestry, probably need more Calcium than others (this is not verified, just an assumption I have made from observation). Some Cattleyas or Laelias (I cannot remember which) do come from environments that provide a steady source of Calcium so it would make sense if this is true.
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