I received a dyson for Christmas (yay, clean house!) but I'm having some issues. We have a rug in our living room that has very thick carpet that has different height on it (it's kinda checkered, if that makes sense). When I have it on the carpet setting and start vacuuming the rug, it sounds ok for a second and then makes a very loud noise like something is stuck in it. I've looked at the belt and in all the places it says to check and there is nothing there. It works just fine on the carpet in our bedrooms and on our wood floors. Anyone have an idea as to what's going on?