Sometimes, as I am trying to tweak the scroll speed to match reality, I have encountered a situation where reducing the Remaining Duration time (or whatever it's called, when you're in Manual mode) seems to have little or no effect on the scroll. I noticed when the lyrics always 'ran out" at the same place (ie, still not going fast enuf). To compensate, I keep lowering the duration.
Finally, out of frustration, I just let it scroll on past the slow spot. Then, toward the end of the song, scrolling suddenly speeded up (kinda like "Uh-oh! I'm running out of time here!). Right at the end, it's just ripping along.
Rebooting, like so many remedies, fixed the problem.
Anybody else see this? It's occasional with me, and only happens when I'm tweaking the scroll speed.