@Michael G - agreed. The swim bladders inflate from intestinal gas, and blockages cause problems with balance. But there is no such thing as swim bladder disease. It's a symptom of a whole lot of things - bowel blockage, infections, cysts, inflammation, wrong food choices... We view it as a disease, but it's a bit like saying a person has sneezing.
I find it's really common, like dropsy (another symptom we call a disease) in older fish, as well.
Violence can be a cause. If the swim bladder gets hit hard, it can rupture. Often people with sneaky attack fish like redtailed sharks, or territorial Cichlids see a lot of fish unable to recover their balance.
The only fish I can think of with a disposition to it are the really grotesque goldfish types, with no dorsals and strange fins. But that's a breeder created problem.