Hard to tell what might be affecting the leaves, but what has been happening is that it comes out full leaf, doing well, then just like that the leaves start to look all mottled and very tine black spots on some of them. Quite a few yellow and drop, and then it all fill in again in a few weeks. Looks good for a week or so, then the same thing happens. Today I sprayed it with some insecticidal soap - stuff is supposed to be safe on just about anything. Have not yet repotted (I had a thread regarding this from back in March).