I would think its the same as with other plants. Its Autumn, the time when lots of plants shed their leaves. Also the weather is a lot cooler now. Perhaps you may be watering too much as the growth in plants slows down at this time of year. Hope some of these suggestions may be useful to you.
I have fuschias and the leaves are falling from them also.
As an after-thought, did you check for diseases? Do they have green fly or white fly?
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