Water damage
is unfortunately not uncommon in many different vehicles.

For example, the Porsche Cayenne is particularly affected, various Audi models are impacted, such as the A4, A5, A6 4F, TT 8J, Q7 4L, and others.
The problem is also known to affect many different BMW models.
The causes vary depending on the model and equipment.
The panoramic sunroof is the most frequent issue.
The drains become clogged over time, overflow, and the water finds its way in.
Often, it runs along metal structures or wiring harnesses.
Pressure equalization flaps near the amplifier are also a common cause of failure.
Under certain driving conditions, specific pressure conditions, or during cleaning, water can enter the vehicle through these openings.

Many customers are surprised to learn that water has entered the vehicle.
They claim everything in the installation area was dry.
The amount of water is often very small and doesn't result in a wet carpet or a puddle.

If the device is reinstalled after repair without addressing the source of the water damage, experience shows that its functionality is only temporary.
Therefore, measures or precautions must be taken to prevent the problem from recurring.
You can often find similar cases online if you search for the relevant vehicle model in conjunction with an amplifier or sound system.