Meaning of falling off

1. The paint on the walls is falling off in chunks due to the damp weather.
2. Be careful with that chair, one of the legs is falling off.
3. I need to fix the handle on this drawer, it's falling off.
4. The car's bumper is falling off after the accident.
5. The leaves are falling off the trees as autumn approaches.
6. I noticed that the buttons on my coat are falling off, I need to sew them back on.
7. The roof tiles are falling off, we need to get them replaced.
8. The quality of the product is falling off, we need to find a new supplier.
9. The paint on the old house is falling off in places, it needs a fresh coat.
10. My motivation for exercise is falling off, I need to find new ways to stay active.