Not to able to continue the lab 3 due to lab usage limit

While I was about to save the Jupyter notebook after complete running the last cell in the assignment notebook, kernel died and not able to save the notebook. When I tried to start the lab, got a message that lab usage time is exceeded. How do I have to proceed with the lab and submit the notebook for grading? Please tell me how to proceed on this. Its been like this for 24hours now.

@nandhinia thank you for the message. Please try again, it should work now.