Glitching and general lagging

Im just really tired of my music stopping randomly to buffer or glitch when I change the song. Im even more irritated with the shuffle feature (unless I havent figured out how to change it) because it doesnt matter how many times I click on the same song with shuffle on it will play the same song after. Anyways, it'd be pretty great if the lagging would stop happening so often so I can actually listen to songs.