This is a small potted tree purchased last spring. It was doing wonderfully on my south-facing deck. I brought it indoors about a month ago because the temps were dropping to about 40 degrees. (Zone 5, Massachusetts) It is sitting at a south facing window. After a week or so, it started dropping leaves, and doesn't seem to want much water. And the leaves keep dropping. Anything I should do for the poor thing? House temp is set at 62 F, as i am not yet living there full time.