I have the same problem as well, it seems to happen after loading a few different tracks, and restarting all the time gets annoying. I tried starting another game after that one time and got an out of video memory error, so maybe it has something to do with that, i don't know. That would make sense though, if switching to 16-bit works as that would require less video memory, right? I have a feeling it's LFS, since i've never seen anything like that before.