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You have not offered even the most basic info, so nobody can even guess. You need to be much, much more specific and provide details about your computer, your project, preview settings and so on.
Sorry for your issue. As Mylenium mentioned, we'd need more details to troubleshoot the issue properly:
Have you tried the suggestions mentioned in the following article: https://www.schoolofmotion.com/blog/cached-preview
Let us know if it helps.