My jade bonsai is losing 3-5 leaves each day from the lower limbs. I recently moved it inside for the winter to a sunny window. Last watered it about ten days ago. All the leaves look and feel healthy, no yellow, no brown; but they just keep dropping. The lower limbs are looking bare. It sits next to a regular, non-bonsai, jade which is very healthy, and is treated identically. Any ideas? Please.