You should not wear the watch in the shower. This is why your sound is damaged - your mis-use.
Important handling information
Exposure to liquid Apple Watch is water resistant but not waterproof. You may, for example, wear and use Apple Watch during exercise (exposure to sweat is OK), in the rain, and while washing your hands. If water splashes on to the watch, wipe it off with a nonabrasive, lint-free cloth. Try to minimize exposing Apple Watch to these substances and follow the instructions below in the “Cleaning and care” section if Apple Watch comes into contact with them:
• Soap, detergent, acids or acidic foods, and any liquids other than fresh water, such as salt water, soapy water, pool water, perfume, insect repellent, lotions, sunscreen, oil, adhesive remover, hair dye, or solvents.
Submerging Apple Watch is not recommended. Apple Watch has a water resistance rating of IPX7 under IEC standard 60529. The leather bands are not water resistant. Water resistance is not a permanent condition and Apple Watch cannot be rechecked or resealed for water resistance. The following may affect the water resistance of Apple Watch and should be avoided:
- Dropping Apple Watch or subjecting it to other impacts.
- Submerging Apple Watch in water for long periods of time.
- Swimming or bathing with Apple Watch.
- Exposing Apple Watch to pressurized water or high velocity water, for example, showering, water skiing, wake boarding, surfing, jet skiing, and so on.
- Wearing Apple Watch in the sauna or steam room.