I have a vanda that recently started yellowing and dropping leaves from the bottom up. A local grower said it could be from exposure to cold. I keep them on my lanai, and it got down to 50 degrees about a month or so ago, then the leaf drop began. Is there any way to save the plant?. It looks like the keiki is ok (so far). Appreciate any help on this. Trying to attach photo, hope it works.