It's funny how a car can look to the casual observer as if there is nothing wrong with it. There aren't any large dents or chips in the paint. There may be a few slight blemishes but nothing that makes anyone question it's durability over the long haul. When the owner complains of problems others don't quite understand why. Everything looks fine. But the driver knows different. First the belts seem to wear quickly, they lose elasticity and won't stay in place. Then the mechanism that holds the hood in place fails, and has to be replaced. Eventually the car begins to fall apart from the inside out. The owner takes the car in, the mechanic looks it over but is perplexed. There really isn't any clear reason the car is having such problems. A few different mechanics are called in, and they too see the issues, but can't really find a link that makes sense. So, they call the owner and explain that they are going to do the best they can to take care of what's going on, but they can't guarantee that there won't be any more problems, or that what they fixed won't break again. The owner leaves the shop frustrated and with nothing more then temporary fixes, and the knowledge that something else will eventually go wrong.
It's like that.