encyclia/dinema polybulbon languishing

[neophyte]

A couple months ago, I placed a few of my orchids in a plastic crate with a saran wrap covering (with a gap for air) and some water at the bottom to create high-humidity conditions. They seem to mostly be doing okay, but the E. polybulbon is going downhill; it's been dropping leaves and generally looking rather sad. Could it be because it doesn't like stagnant air? Previously it had been out in open air and was watered pretty consistently, but none of its sheaths produced buds, so I thought it might like the extra humidity.