Tantrums have recently become an evolved way of communication by kids.
Why I am saying evolved is because when you find some better and effective tool in your present situation, you seem to have evolved it.
May be this form of communication have served their purpose better.
Or maybe there is something else troubling the child and he is not able to communicate.
What it could be and how can we help, not only the child but ourself.
To know the answers, check out- From Monkeying to Parenting
Because Parenting matters !!