Most of the leaves of my indoor plant just dropped off. They were not brown or droopy. It has 3 new blooms.
Certified GKH Gardening Expert
There are a multitude of things that can cause this. Leaf drop is a complicated subject, as there are many factors involved.
This can be due to being next to a cool window. Too much or too little light, over, or underwatering, low humidity, and many other factors.
This link will help you start crossing out the factors one at a time: https://www.gardeningknowhow.com/houseplants/anthurium/anthurium-care.htm