I got a couple plants and changed the soil, I also washed them off. After about a week both are losing all their leaves. The ficus has lost all its leaves the other plant lost about 70%. The plant lady said the change shocked them but they should come back. Has anyone else had this problem? How can I avoid it? Do I need to even change the soil? The plant lady said there is no need b/c the plants have been in the same soil for over a year with nothing added 2 them so all the chemicals have been washed out.