Having issues with the music player

[AC Question]

Hey hey,

So when im listening to music off my S5 it'll play the whole song through and then switch to the next song but it wont play until i physically push the play button. as you can imagine this is severally inconvenient when working or doing whatever. Im new to samsung and android altogether so maybe this is a quick fix but i cant figure it out. Any help would be great!
thanks