Can any audio electronics people help me?

I recently got an Amazon Echo Auto for my car, and generally I love it. BUT, I have some audio issues with certain genres types like hip hop, rap and hard rock like Linkin Park and the like...basically anything with heavy bass use. What’s happening is a distortion noise that sounds like all my speakers are cracked.

I have it set up with my iPhone blue toothed to it and then an aux cord from Alexa to the car. I have a ground loop isolator between the aux cord and the aux input, and the aux cord itself is a brand new Monster brand one.

The puzzling part is that I only have the distortion issue with music played by Alexa. If I play pandora from my phone the music is just fine.

Any ideas on how to solve the distortion issue?

Thanks in advance 🙂