clang code model stops working properly on a file

This has been an issue for many versions.

Seemingly randomly, the clang code model stops working properly for a file.

Things like highlighting and refactoring no longer work properly.

The attached image shows my cursor is over the "pixmap" variable (for 1+ minute), but as you can see, instances of the "filename" variable are still highlighted.

If I try to refactor a variable in this state, it will modify the variable I'm changing, but not any of the other references.

The GIF shows this. I try to refactor the "pixmap" variable, but it doesn't modify any of the references.

The only way I've found to fix this is to close and reopen the file.