Always. To my knowledge, it doesn't actually support the loop command. There are a couple ways around it, but the most elegant to me was to use a playback position as a trigger to play the track again (you have to alternate tags or it won't work) and place the audio in as a sound effect and not music--you can only have one music track playing at a time. If you're interested, I can detail it a little better later today. It requires a little change in how you would normally make music loops.
The alternative i came up with is to seeks back to a specific value when its at the end, but it still slightly noticeable. But if your method works great ill implement it.