- Overall, your plant looks healthy. It is normal for some of the older, lower leaves to discolor and fall off as part of its natural aging process. However, there are two things that can hasten this process - inadequate light and improper watering.
Make sure that it stays in front of that window and that the window is completely uncovered throughout the daylight hours. Normally, it is best to water thoroughly as soon as the surface of the soil feels almost dry. However, it yours was repotted, then that will affect the watering and I would have to see a photo fo the pot and have details on the repotting to provide better information.