Stereo Static Problem

Hey all,

Got a 2013 PreRunner and there's a problem with the trucks audio. It doesn't matter what's being played, there's a constant cutting in and out for the audio. Even if it's turned off you can hear the static, like it's trying to get something through.
Sound pops in and out and occasionally brings everything back for a period of time.

Here's a video to show: https://www.youtube.com/watch?v=zMUik-4Dd3U&feature=youtu.be

Anyone run into this before or know what I need to be looking at to get it fixed. I can usually fix just about anything but I've not dealt with any kind of wiring in vehicles before.

Appreciate it!