Windows Media Player Overloads Notebook HDD On Audio File Playback?

Ok so here's the deal, i have Asus Z99 notebook and whenever i start listening music on my WMP my HDD light lights up and never goes off also sometimes when i change the volume up or down my wmp also gets stuck on some track moment like old scratched audio cd on a cheap music player that the only way to stop that i have too hold my power on until my notebook turns off. Same thing hapens on winamp whenever i set the volume to max. It's weird because this only happens when i listen music through notebook speakers whenever i have my headphones or my amp plugged in this never happens. What could be the glitch that causes this? Did this sorta thing ever happened to you?