Default M8 Harman/Kardon Audio bugging

Hello

somehow if I install Harman Kardon Audio on my M8 the sound "bugs" while playing music and for example a notification comes in.
Like it stops for a milisecond and then continues. It's kinda annoying. (Dont have that without)
im S-off.
any help? Im using ARHD 10.2 and H/K mod 4.1