Welcome to the forum.
This tree is slowly dying, just like soooo many others. Have you done a search on the forum? This is Nr 1001 this week with the same problem.
- This plant was put in a small pot probably in bad soil
- It is a tropical species. With luck it was not sent to you directly from a tropical moist greenhouse. But it might be. Transition leads to leaf drop. Unless you are skilled in growing plants this may cause death
- Watering is done when needed, not on a schedule. Keep damp, not wet. Do not let the substrate drie out for more than the first half cm of the topsoil
- Do NOT fertilize unhealthy plants. Fertilizer is NOT plant food and wil NOT improve the health of the plant
- Ensure it is not sitting on top of a heater unless you really know what you are doing