How are you culturing them? Light level, watering, mix, and humidity?
It was my experience that they liked higher humidity (70%), higher light but not full sun. They did well with slipper orchids. Water as they approach dryness but don't let them go fully dry. I grew mine in Sphag and changed the medium yearly. They don't like it too cold. 70- 80 F during day 10-15 cooler at night.