What is causing the leaves of our Rubber Tree to droop?

Question

We started out with a very healthy rubber tree then slowly all the leaves began to droop.

Answer 1

Overly wet soil can cause drooping. It could have been overwatered. If it was overwatered, even once, it may have root rot. This article has more information: https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm