Rog Phone AUX ISSUE 2!

[Yaniwei]

Second discussion...
Noise coming with music I play in my car, any suggestions ?

[Anders_ASUS]

Do you have the same issue if you connect your ROG to stereo at home? If not, then I still recommend you to buy a ground loop noise isolator. They're really cheap.

[Yaniwei]

Anders_ASUS said:

Do you have the same issue if you connect your ROG to stereo at home? If not, then I still recommend you to buy a ground loop noise isolator. They're really cheap.

At home and in other cars everything is ok, but I don't think this is the case where I need ground loop. I made a short video please check it out. In which cases exactly is needed ground loop ? I don't connect my phone to charge from car. 
https://drive.google.com/file/d/1tXkf5AGJ0UsvSq4-8Nog54GmYEetL8j4/view?usp=drivesdk