No, haven't heard of other users experiencing your exact issue. Because we can't see your return in this forum, and because there are infinite number of user computer/internet configurations, all we can do is offer suggestions that may help.
If you Contact TurboTax Support, they can actually get into your computer to diagnose the issue.
Try a different browser, clear your Cache and Cookies, delete/re-enter vehicle info from scratch, make sure no large programs are running in the background (like email), are some things you can try.
Here's more info on Using a Vehicle for Business.
@jyeh74
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