Is it a phal-type or the type that is supposed to lose their leaves? Phal-types lose their leaves if they are overwatered and the roots rot, don't get enough light, aren't snug in the pot and are moved around (that is why when repotting, they should be staked), if they are too cold, or if their conditions change drastically (Hawaii to Ohio during the winter). Unless they are too cold or overwatered, once they adjust, the leaf drop will stop.
I hope this helps,
leafmite
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