What?? Going by already??

[greenpassion]

I have a Phal that when in bloom, has always lasted a minimum of 6 mths-but when I came home from work tonight, I saw that several flowers on one of the spikes are going limp. They aren't looking like the way blooms usually look when 'going by'. No dry looking wilt-the pedals are simply limp. What is going on?? It was fine when left today, and I've done nothing different at all with it! This is very upsetting for me. It isn't thirsty(still have green roots showing thru the pot) and temps and humidity are exactly the same as always... Help??