I have had this plant for several years. Within the past couple months I noticed a few leaves yellowing, but lately it has accelerated greatly to where about half have fallen. I water regularly and keep the soil moist. The pot is large and does have drainage holes. I stopped watering about 2 weeks ago to let the soil dry out but that hasnt seemed to help. This year I have noticed earthworms and centipedes in the soil if I dig around.