As no one has answered may I ask if you have inspected the roots to make sure it is not infested, pot bound or short of water? Do you think it was too hot indoors all summer?
I found this for you:
Growing Conditions - hope it helps.
Plant in well drained sunny position or well lit open indoor situation.
Plant Care
A good open soil or potting mix is necessary. Keep Moist but do not ever stand in water. Tip prune lightly to keep the plant compact. Fertilize in early Spring and Summer for best results.

Thanks for the reply, only thing I haven't checked yet is root infestation. Will keep you posted.

:))