I’ve done a MiB 2 retro fit in my 2014 seat Leon sc everything is fine but when I get inside the car I can hear a static noise coming from the passenger side pilar speaker the speaker is fine as I’ve plugged a new one in and the same static noise happens from the same speaker also I have put another MiB 2 box in the car and the same static noise is happening and as soon as I connect my phone to the car it stops why is this