Sometimes my MacBook Air does not turn on, why?

Just recently, when I press the power button nothing happens. No sounds, chirps, or lights.

I attempt to hold down the power button for 10sec but nothing.

I connect to the charger, and the light turns yellow or green as normal, depending on the charge. But when I press the power button: no sounds, chirps, or lights.

After awhile, I press the power button and the mac will turn on normally after I press the power button.

I bought this mac in Jan, brand new.

Thanks for reading.