Very often when I search something Scrivener does not react anymore, fades out, "No response" is shown

Very often when I search something Scrivener does not react anymore, fades out, “No response” is shown:

I have to close it by the Task Manager or clicking the red cross a few times. After restarting Scrivener the same happens again and again, so it is not possible to use the search.

How could I make Scrivener work correctly?