Mobile is not working

Hi this is jeelan basha, 2 days ago i was updated my mobile lenovo a6000 plus for lollipop 5.0.2 after updating it worked only 2 days, after 2 days the phone is automatically shutdown.

Don't know why and what happened to that, suddenly it was shutdown.

Is there any software problem in that, because present it is not working. Can you give me the suggestion plz.