I had a similar problem with my vanda, and I ended up making a cedar basket for it and potting it in a mixture of lava rock, charcoal, coconut husk chips and sphagnum. I also put a 23 watt CFL bulb right next to it. The leaf drop stopped immediately, and new fat root tips are growing from the old thin roots.
I see that you're also in Canada - vandas are a challenge in our climate and indoor conditions. Bare root works only in greenhouses.