computer shutting down

Surf2000 wrote:

Why does my computer automatically shut down?

Learn what to do if your computer restarts or shuts down unexpectedly,

or you get a message that your computer restarted or shut down because

of a problem.

If your Mac restarted because of a problem - Apple Support

I have a Macbook Air and this computer shuts down and still has a charge when it is at 65%.