See, "lack of attention" is what mine get, too, and they thrive on it. If I don't water them for a couple of months, they dry out but come right back when I give them a drink. I plant them in regular bagged planter mix or in the garden, and then I ignore them.
Here they die back like crazy in the winter when it's cold and rainy, but most of them bounce right back after the frost is over and the rain stops. They definitely sulk in the wet, which was why I thought of your humid air.
I have had problems with mealybugs, and I've lost some to them that I tried and tried to salvage, but to date I've been unsuccessful getting rid of them once they settle in on a plant.
