Repot it soon after I got it...this is the 2nd blooming under my care...however it has this issue which I think it's bacterial...leaves start to get yellow and 3 to 4 days later they fall. This seems to be happening only on older growths.
I also found that there was an ants nest in the pot...drown them all, obviously (but it was interesting to watch them trying to save all the larvae by climbing to the tip of the leaves, holding them in the fangs).
Anyway, I tried to see the reaction to an anti-fungal treatment but so far, no good.
But the plant is growing new roots.
Here's some photos with an advise request about available treatments in Europe.
My Cochleanthes in bloom and diseased
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