Bump

How big is the entire plant? How many leaves have fallen off?

I lost about 7 leaves. It's not a big plant but not a little starter either.

Older or newer leaves (or a mix)? Sometimes, they just abort for whatever reason (faulty genes, damage to the petioles, sapsucking bugs, etc.). As long as there is no sign of fungus/bacteria/pests, I'd just chalk it up to random nature.

They were mostly newer leaves. I've since treated with imidacloprid and Forbid. Hopefully I won't lose anymore. Thanks.

I started losing a few more leaves and sure enough after checking the roots, they did NOT look good. So I now have cuttings rooting on a heat mat. Again, this was a Hoya in that soil/ saw dust mix. While most of the pot was pretty dry (I know that Micrantha doesn't need to be watered as often due to their succulent leaves) the center of the pot midway to bottom was still moist and the roots and stem were turning blackish in color. Ugh, I don't like this type of mix at all.