This morning, when you're sipping your coffee, do the dollar test with your fridge: Close the fridge's door onto a dollar bill and see how much effort it takes for you to pull it out. If it comes out easily, the seal isn't tight enough; it's leaking cold air and needs to be fixed. Another test: Open the fridge door and let go. If it doesn't shut by itself, it needs to be re-stabilized. Shift the whole fridge until it's level and try it again.