my apple mac is shutting down unexpectedly

vimalr123 wrote:

my apple mac is shutting down unexpectedly. This is happening intermittently

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 understand your MacBook Air is spontaneously shutting down. Does it provide any alert or dialog when you power it up again?