I was going to ask you that as well, did the pollen cap get knocked off? They come off quite easily if something brushes against them.
It could also be the open window, depending on how much of a draft and change in temperature the plant is getting.
Last possibility, did you have any ripe fruit close to the plant? Ethylene gas emitted by ripe fruit triggers ethylene production in fruit/flowers that are exposed to it, leading to senescence. I discovered how powerful this effect can be when I once moved a newly blooming Phal to the kitchen countertop, right next to some ripe bananas. The next morning all the open blooms had wilted.
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Camille
Completely orchid obsessed and loving every minute of it....
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