Had the exact same problem and for me the fix was thrashing all cache and preview files. (I deleted Media cache, Media cache files, peak files and all audio and video preview files.) Now when Premiere has re-generated the files, everything works fine. I think the problem started after Premiere update. Adobe recommends deleting Media Cache files before update. I did not know that before, so I think the problem was caused by not deleting those media cache files before update.
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