Status code 422 after sending a large number of API calls

When large sets of API calls were made, where these calls were sent in quick succession or in parallel, it could occur that these API calls were not processed correctly and a status message 422 Unprocessable Entity was returned. We have made some adjustments, reducing the frequency of failed call transmissions. For a GET and a PUT, a 422 status code is no longer returned, but a 500 Internal Server Error.