Hello, I am having troubles identifying what is the problem in this case. This tree is a new member of my collection, but this week it started shedding leaves. What concerns me is that the leaves in the core seem to be yellowing, but the outer ones seem okay and growing. I try to keep the soil moist on the touch, but not overwatered by leaving the upper part dry before watering again. It is localized under south/east window, so it should be getting enough sunlight. Could it have been that it got cold very suddenly, and it spent a couple of nights in temperatures around 14 °C?
Thank you very much for help!