Whenever I'm using animated signs in lagoon, they sometimes freeze in place. I try to exit out of the track and back in to fix it, but when I go back in, the signs go entirely black. So, re-entering the game doesn't fix the problem, it makes the problem worse. What do I do?

I thought of a solution that I could place all the other signs, use non-animated signs as placeholders and then add the animated signs and avoid placing more signs.