I had the same few years ago.In budding stage it needs low temp, max. 18-20 C, no more, just a little water but high humidity, at least 75 %. In any case plant drops down the bud.
This is a first bloom, I have another one that blasted last year grown indoors. This one had cool nights, night time temps are set on 59 degrees, some daytime tamps reached 85.
Tell me about it!