Ficus dropping leaves
My ficus (not sure of the variety - its the common one - lots of branching) has started dropping perfectly healthy looking leaves! (I'm not talking about dried up leaves.) At least a dozen green leaves are laying on the floor every day. I've checked it over and do not see any bugs on it. My plant is about 5 feet tall and in a pot that's 10 inches tall and 10 inches in diameter. Could it be root-bound?? I've had this plant for years and never had any problems with it. I do fertilize it regularly during the summer months. Any ideas on what could be causing this?
Thanks in advance for any help!