HTTPError: 503 Service Unavailable: Trying to retrive news stories with Eikon Web and Scripting API

I am trying to retrieve news data with Eikon Web and Scripting API from Eikon Database.

The Headline retrieval works fine but if I try to get news texts I get the following:

     21 for index, headline_row in headlines_summary.iterrows():
---> 22     story = ek.get_news_story(headline_row['storyId'])
     23     stories.append(story)
     24     sleep(0.1)

C:\Anaconda3\lib\site-packages\eikon\news_request.py in get_news_story(story_id, raw_output, debug)
    161     app_id = eikon.get_app_id()
    162     payload = {'attributionCode': '', 'productName': app_id, 'storyId': story_id}
--> 163     json_data = eikon.json_requests.send_json_request(News_Story_UDF_endpoint, payload, debug=debug)
    164 
    165     if raw_output:

C:\Anaconda3\lib\site-packages\eikon\json_requests.py in send_json_request(entity, payload, ID, debug)
     80             if response.status_code == 200:
     81                 result = response.json()
---> 82                 check_server_error(result)
     83                 return result
     84             if response.status_code == 401:

C:\Anaconda3\lib\site-packages\eikon\json_requests.py in check_server_error(server_response)
    128         else:
    129             status_code = server_response['ErrorCode']
--> 130         raise requests.HTTPError(error_message, response=server_response)
    131 
    132     # check DataGrid error

HTTPError: 503 Service Unavailable

I tried to put in some sleeptime. Without success.

Is there a known solution for my problem?

Thanks in advance.