I'm having the exact same problem using version 12.0.1. If this is a version issue, I've heard upgrading your Premiere software in the midst of an ongoing project (which mine is) is dangerous. I'd like to find a solution that doesn't involve upgrading to the latest version of Premiere. Any ideas?
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There is an old belief that it is, to work continuously with different projects without having the precaution of cleaning when the project concludes it has less memory to the program, it was said that Premiere in the boot loads a lot of cache elements.
Go to: Edit> Preferences> Media Cache and press Delete Unused
Comment if this solved your problem ..
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