The answer to 'why is my vacuum water damage' is that your vacuum has likely been exposed to excessive moisture or water. This can happen if you've used the vacuum to clean up a liquid spill, or if the vacuum has been stored in a damp environment. When a vacuum gets water damage, it can lead to issues like the motor failing, the filters becoming clogged, and the electrical components shorting out.
Some common symptoms of a water-damaged vacuum include reduced suction power, strange noises coming from the motor, and the vacuum shutting off unexpectedly. In severe cases, the vacuum may not turn on at all. If you suspect your vacuum has water damage, it's best to stop using it immediately and take steps to dry it out or have it professionally repaired.