I had the same problem with DSLR Footage.
The problem was solved.
1. Remember the clip numbers that have this problem.
2. Go to Edit/Preferences/Media in your Premiere and click Clean Cache
3. Quit out of premiere.
3. Go to Media Cache Files folder (by default on PC this folder is located C/Users/-your user-/AppData/Roaming/Adobe/Common/Media Cache Files)
4. Delete all the files that have corrupted files name in it. It should be 2 cache files for each video file *.pek and *.cfa (might be more)
5. Open premiere and import one by one each corrupted file, giving some time after import for the file to be confirmed.