Well here are a few ideas:
Dropping leaves could mean your plant is too wet or too dry, or it could need more sunlight or it could need more nitrogen.
Is it raining a lot where you live ? usually Jade plants like to be thoroughly watered, and then not watered again until the soil feels dry...
and they like direct sunlight a half day or more.
Also what is different between the inside of your house & the outside. is it the temperature?
someone else may come along as well to give you ideas.