Popping sound when switching source on monitor. (Astro MixAmp Pro TR)

Hi! First off, lets get through how my setup is setup Image may be NSFW.
Clik here to view.

So I have an Astro MixAmp Pro TR hooked through the optical cable from the MixAmp to the PS4 and then from the USB port of the MixAmp to a USB port on my PC. And I am using it like this so I can listen to music or talk to my friends on PC while playing games on PS4 at the same time.

So with that out of the way, here's my 'issue', I have been noticing that when I switch source on my gaming monitor I can sometimes hear a popping sound in...

Popping sound when switching source on monitor. (Astro MixAmp Pro TR)