I just bought a house that is 9 years old. The dishwasher cleans great, but the top basket has issues. It will pull out without problem, but when I push it back in, the track does not move back in with the basket and the basket wheels fall off the back of the track which makes the basket fall off the back (both sides). I can't figure out what the problem is - if I have a defective part, a missing part, the basket needs maintenance, or whatever. Any help would be appreciated.