It could just be old leaves dying off, or lack of humidity in the air. If you have drainage holes in the pot, then drowning shouldn't be a concern,when watering, but they do enjoy misting. Cut back on feeding it for the winter, and if you have had it for awhile, you might check to make sure it is not pot bound. If you are getting brown tips in addition to the yellowing, then the plant is a bit close to the window, but as the light is probably getting weaker anyway, that may not be anything to deal w until spring. Good luck!