HTC One M8 :: Music Dropouts When Phone Writes?

I recently have come across an issue when playing music.

Doesn't matter if the music is on the internal / sd card / streaming.

It appears that this happens when ever I am downloading updates/installing or getting a gps lock or if the phone starts doing something in the background.

This is a fairly new issue as the music will start to drop out during playback (0.5 seconds or so) and will continue until the phone stops doing whatever it's doing ion the background.