Habanero Chilies Fall Off Plant Before Maturing
My habanero chilies as well as other varieties seem to go through this same cycle. They produce lots of flowers and peppers (about 50), but as they mature, only a few make it to full maturity, the rest start dropping off the plant and the top of the plant stops to grow and turns a bit yellow. Then about 3 weeks after all the chilies fall off, the plant will start to grow nice and green again and produce flowers and chilies and go through the cycle again. I never had any problems growing chili peppers in Northern California but now I live in a humid tropical location and can't get them to grow properly.
Certified GKH Gardening Expert
This looks a bit like, both, phosphorus and magnesium deficiencies. It could indicate a true deficiency or it could indicate a pH imbalance.
Testing pH first, would be recommended. After, you can test for deficiencies.
These articles will help:
This article will help you to grow Habaneros: https://www.gardeningknowhow.com/edible/vegetables/pepper/growing-habanero-peppers.htm