Vanda- yellow leaves- old roots fell off.

[Orchid Davantage]

I got this Vanda in April this year, it had long roots and was difficult to water. I lost a lot of roots along the way till it went outside in May. It seemed fine during the summer, not great, but alright, now new leaves that I could see, the new root was growing, even though it looked cracked in some places. Towards the end of the Summer, in September, after a storm, I noticed the Vanda was bent below the new root but above the olds roots, it turns out the old root system had rotten and was falling off. Two leaves had the base of the stem had yellowed out and I removed them. The next two leaves up from that also became yellow and fell off. I took the plant inside 2 weeks ago. October was wet and I should probably have taken it inside earlier. The yellowing continues. I have 2 more leaves that are yellow. Other than the new root the plant has grown, there are no other roots. The plant is hanging from one of my plumerias, by a window. I also have a light right next to it. If the yellowing continues at this rhythm, the plant will be dead by Christmas. I mist the roots several times a day, and by that I mean very thoroughly till the water drips off the root. I have sprayed the root with orchid food twice so far.