Zygopetalem Mackayi 'Pacific Spirit'

[Ranchnanny]

I have had this very small orchid for about 8 months and now its gone to orchid heaven I had the Zygo in s/h and it seemed to be doing well showing new a new leaf but thats all. I had it in the orchidarium for awhile then took it out. I did something wrong
It turned yellow then the leaves started getting brown what did I do wrong

Any suggestions

Sheridan