I recently fit a new car audio unit to the car with the correct BMW iso fitment, and at first it sounded great. But within a certain period of time I get a lot of static/hiss noise which gets ever louder through the USB input and Bluebooth while I drive. I stop the car, put it into ignition and the audio changes tone. Turn the car off, back on and the noise is gone, only for it to re-appear again as I drive.
Video Provided
https://streamable.com/d71eog
Please please help
Video Provided
https://streamable.com/d71eog
Please please help