samsung fridge freezer?

Its those american type fridges i have. Does anyone know why all of a sudden the motor on it has started to makes lots of noise. It is really irritating. when you open the the fridge door it stops for about two mins then starts again. now and again it will go really quite.then the noise starts up again there is nothing against it. I have moved everything from the fridge so there is nothing ratleling around there. i am stumpted as to what this may be. we did move it a few weeks ago to put down some new flooring . Can anyone help