Hi R0za,
I would love to know if the leaves are turning color before they drop, and if so, what color. Take a look to see if it's rootbound. You will probably see roots coming out of the drainage hole. If so, repot in a pot that is 2" larger. Another situation that will stress acubas is too much sun. They like bright light, but not direct sun. Take a look at this site to see if this could be your problem. They also need good drainage and don't like to sit in damp soil. Let soil dry on the top 2" before watering. Don't let it sit in a saucer of water for more than an hour.
http://www.ces.ncsu.edu/depts/pp/not...od21aucuba.htm
Take a look here for more culture info.
http://hort.ifas.ufl.edu/shrubs/AUCJAPA.PDF
Hope this helps. If not, let me know.
Newt

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