The hinges have gone bad. It will likely not some thing you can see readaly. Be carefull when removing the glass of the door. There are 3-4 screws along the bottom of the door and two that come from the inside and attatch the handle. You will see the other screws to replace the hinges.
Click here for parts
The door switch controls the light and the speed fan. These will work again when the hinges are replaced. Also the oven will hold a better temp.