I saved my artwork file, my laptop shuts down and the file doesnt show up on my documents... I saved another file and the same thing happened again.

This has become annoying to me. I saved a file and my laptop had to shut down (i had to auto shut down because it froze). Then when i start it back up adobe illustrator shows nothing and my file is not in my documents or anywhere to be found. Then i just decided to redraw the drawing i was doing, and then once again my laptop shuts down. This time i was absolutely sure i saved the file right before i was going to add more details to it later, and the same thing happens again, my file was not saved!