I checked the logs and it looks like the model was giving the errors on certain samples, below was the error
RuntimeError: The size of tensor a (552) must match the size of tensor b (512) at non-singleton dimension 1
You can try fixing the issue by adding try/except block.
For the submission to not count when it fails, we have added a 10 failed submissions limit 
meaning that you can have almost 10 fails submissions for a day.