Recently when I shut my microwave door there are times the light inside the microwave stays on and the turn table spins slowly. The microwave is not heating anything. If I open up the door then the turn table stops spinning, but once I close it again, the light still stays on and the turn table spins once again.

There are instances if I shut the microwave door hard enough, then the light will go off and the turn table does not spin.

Any idea what is wrong?

Thanks in advance.