Sounds not always playing when called

I have a custom player tick procedure set up so that music plays, then sets a global timer to the length of the song in ticks and counts down until it reaches 0 and loops back. The problem is that when it reaches 0 and loops back it doesn't always play the music, even though it's being called at the same time (the loop still works and so I have to wait until it ticks down again to get a chance for music to play). I do have two different tracks that can play randomly, and each has its own length in ticks set when it is called, so the timing is not wrong. I want it to be a constant loop, does anyone have any idea what's wrong?