I have a phal that has been blooming since November and none of the blooms have fallen. I have another one starting to bloom. I have 5 more phals that have single spikes coming out. I have Onc Sharry Baby blooming and 2 more noid oncidium blooming.
hmmm......are you watering more than once per week ? With lower humidity I definitely had to water more than 1x per week ( before I had the whole home humidifier fixed ). You will probably have to adjust your watering schedule, keep a close watch. Anyway, higher humidity is better for you personally !