While getting into the car and sitting down (kind of making the car bounce very slightly), the "door open" light flickers on and off. Also the fuel gauge bounces up and down from top to bottom of the gauge and I hear a very slight buzz. It does this sometimes and sometimes it does not. Then while driving the door open light flickers on and off and the doors are shut tight. The gas gauge bounces up and down sometimes when I stop at a traffic light or such. I am at a loss as to why, has anybody had this happen or have any ideas?