Flower buds falling off Cymbidium spike

[ciaoamalfi]

Hi WhiteRabbit & Gin! Thanks for the ideas. No, it's not near any drafts. But it was cold last week and we've been using our bigger electric heater, which is definitely dry heat. The heater is in the next room, but it's a small apartment. I'm better that is the culprit! Thanks to everyone for helping me understand. If we use that heater a lot I'll move the plant into another room where the heater doesn't reach as well.

Grazie mille!!!
-Laura