iPhone 8 Plus audio crackling on iOS 11 (not during a phone call)

This has been happening ever since I got my 8 Plus. Easiest way to replicate for me is:

• Play something in Apple Music
• Go to Twitter app and scroll through feed (or any app that has auto-playing video that is muted)
• When the video starts playing, my music crackles for a second then returns to normal. This repeats every time I scroll past a video and it starts playing in the Twitter app.

This crackling happens with any app that has auto-playing video, it also happens randomly when using the system in general.

I can't tell if this is a remnant of the crackling issue during phone calls on the 8 Plus. Interested to see if anyone else is experiencing this.