Can't submit assignment 2 of week 4 of Course 1 since it gets stuck

When I hit submit it just gets stuck in “Submitting …” Is there anything I can do to fix it?

Actually, it just took a few minutes then it succeeded.

That’s great! Yes, sometimes it can be a bit slow if the servers are busy. The other thing to be aware of is that it will hang like that if there are any cells in your notebook that are still running at the time you click “Submit Assignment”. E.g. if you were running one of the training cells that does 2500 iterations, that might take a while to complete.