Probably a GPU issue? Mine would crash the OS. New drivers, rolling back a Dell thermal platform framework, and Vegas 16 helped me. Can your system do a graphics benchmark without crashing? Mine couldn't.
Specs of that laptop please, plus buildnr Vegas 16, plus MediaInfo of the used files, plus a screenshot of your (customized) used rendertemplate, plus the goal where to play the file you want to make. If you want real help you have to provide these things with help of the upload button on the top of your to make comment.
If it is a laptop, your ventilation system may be clogged with dust, and when it goes to render, and the CPU and GPU start cranking out heat, it is unable to properly cool itself and it shuts down to protect itself. I would check the system's vents to make sure they are free of dust, and if it is bad enough, open up the case and remove the dust. Try to remove the dust with a can of compressed air first.
I've pulled mini-bricks of dust out of laptop vents before. They can clog up easily.
If it is a laptop, your ventilation system may be clogged with dust, and when it goes to render, and the CPU and GPU start cranking out heat, it is unable to properly cool itself and it shuts down to protect itself. I would check the system's vents to make sure they are free of dust, and if it is bad enough, open up the case and remove the dust. Try to remove the dust with a can of compressed air first.
I've pulled mini-bricks of dust out of laptop vents before. They can clog up easily.
I've had this issue in the past - make sure your cooling is up to snuff for running your computer at maximum output for as long as a render takes. I went to 6 fans, liquid cooling on the CPU. I think a lot of folks underestimate the level of cooling needed. There are free apps for measuring your CPU temp, run one and see what happens when your render fails.
Former user
wrote on 7/12/2019, 10:04 PM
Unrelated to your issue, but I have noticed in the past when I had rendered long videos overnight, I'd wake up and see that my computer has turned off which only should happen after render completes, (turn off after 1 hour of inactivity) but renders were not complete & I had thought the computer was not respecting vegas rendering as being active. It turned out though when rendering stops partial way through due to some sort of vegas error the computer was going to sleep 1 hour later, it wasn't that the sleeping computer was ruining hours of rendering.