This is how I reproduce the issue:
'16 Mazda CX-5 turned On, the shifter in Park, and the radio On, I begin to press the brake slowly. While the brake is slightly pressed but the brake lights are OFF, nothing happens. As soon as the brake light turns on, the radio interference occurs.
I just noticed because I only listen to the radio on long drives through rural areas, so I simply thought that the antenna was just not picking up the signal.
What can it be? It doesn’t happen with the emergency brake.