I have an orchid plant and the leaves at the top of the stem have follen off... after 2 months?

Have you watered it too much? Have you watered it too little? Is it getting too much sun? Too little sun? Are you supporting the plant so it won't fall over? Orchids are famously very finicky and fragile. I wouldn't panic until more leaves start dropping. Did you fertilize it too much or too little? Loud stereos sometimes make plants die, as do putting coffee, cream, tea leftovers in there,