Sunburn, rot, or disease?

[Nixus00]

I've been growing a smaller sized dendrobium for about two years now. I have had numerous flower spikes from the plant and decided to build an orchid basket to hang it outside.

However, after about a week-2 weeks, the leaves began to discolor and drop. I'm now only left with a few leaves on the top of each spire. I was wondering if anyone could tell me here what it looks like to you.

I live in SoCal, and have the plant on the western facing side of the house. If there's any other info that is needed from me, please let me know. Thanks!