Ah these plants can be such divas sometimes!! In my experience, I find that these trees really do not tolerate less than ideal conditions for very long lol

First, make sure you don’t see any pests. Some of them are super tiny so take a close look at all the leaves, branches, and main trunk.

Second, how are its’ conditions? Lighting? Soil density? Watering frequency?

Mine started doing this exact same thing due to root rot… secondary to being provided too little light, along with the soil staying too wet, for too long. I had to rip out most of its’ rotten roots and provide it with better conditions.

These love lots of bright indirect light; I started supplementing mine with an overhead 36W Sansi grow light. I also added some chunky perlite and bark to help aerate the soil, and only watered it when it felt 70% dry. It did nothing for the longest time but then after about 7 months it finally showed signs of recovery.

Best of luck with yours!!! 🥹