JB, I don't know what to tell you. Except that I've had similar problems with mine during the winter and I'm still learning about growing these plants. I did note that this time, aside from the humidity issues, my soil mix stayed too moist. It was fine when the plants were outdoors during the summer, but the plants suffered in the winter when I brought them in. I don't think that they like to be watered much during the winter. They do have succulent roots, after all. Also, they don't appear to like cold drafts and detest fluoridated water, which I know that you don't use. But, speaking of, does your mix have a lot of perlite in it? Doesn't that have quite a bit of fluoride in it? Usually, they bounce back during the warmer months. I wonder if they go through a dormant period. Any thoughts?