Pds doesn't load my questionnaire

I am trying to load a questionnaire with 1414 questions on a pds. After some minutes I get an error message:

Designer unavailable. Please make sure that Designer is not in the maintenance mode

I retried several times.
There are no attachments in the qx.
Webtester works fine.

Could this be a limitation of a pds?
Or is Designer not working properly at the moment?

Thanks,
Klaus

I can successfuly import other (smaller) questionnaires.
The Healthcheck is fine.

Hello @klaus, thank you very much for reporting the issue. We will look into it.
The ticket number for this issue is:

Hurrah! I confirm that I can now import the questionnaire.
Thanks for fixing the bug so quickly.