Coaster Audio & Aging Issues

I have a coaster that I built to a custom soundtrack. Over time, even though I've done nothing the audio no longer syncs. It's as if the coaster was going slower, yet that's impossible since it wouldn't make it around the course if it did that. Anyone else have this issue and know how to resolve it? I've refurbished so many times, etc... tweaked the release speed, drive tires, etc.. :(
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