What is the cause of crackling noise in my Audi A5's audio system?

I have been experiencing crackling noises coming from my Audi A5's audio system. It happens randomly while listening to music or during phone calls. I have tried adjusting the volume and checking for loose connections, but the issue persists. What could be causing this noise and how can it be fixed?

This could be due to a faulty audio amplifier or a loose connection in the speaker wiring. I suggest taking your car to a trusted mechanic to have it checked and repaired if necessary.