Then starting computer

Then have a few suggestions ;

1 - Get Support Choose a product and we’ll find you the best solution.Start now and open an Apple Support Ticket as they are Apple Employees to deal will these types of issues . 

2 - Product Feedback - Apple and make it known to Apple regarding this ongoing issue 

3 - Have the computer evaluated by the Professionals who have the Special Hardware Software and Expertise to diagnose the issue and offer possible solutions

4 - Make an Appointment at the Apple Genius Bar and have them evaluate the computer

What happened BEFORE this? Did your computer restart on its own? Did you force it to shut down by pressing and holding the power button?

Try restarting in Safe Mode. Then restart normally. Any error messages? Does the problem reoccur after that?

When a Application is Open and the Computer Shuts Down because of a Problem.

It will often times offer to Reopen the Application that was Open when it Shutdown.

Example - I have Safari Open and if I choose to Shutdown Normally.

The pop Up message in image below will offer to re-Open Safari the next time the computer Restarts

In your case, the computer was shutdown because of a Problem

In your image in Original Posting, did the user choose Cancel or Open ?

All yours to help OP, my friend