Overexposure on outdoors shots

I think it is a case of defective apparture system. the system controlling the change of apparture opening has been locked. the reason may be friction in the blade movement or defective flex pcb carring the signal to the apparture motor.

It sounds like a sticky iris. When a camera requirers more light it opens it's iris to allow more to enter. Whilst inside the iris needs to be open wide because it's darker. When you go outside the iris tries to close down to avoid over exposure which isn't happening in your case. The iris is still open wide. Try a little experiment, Go outside in the bright light and look down the barrel of the lens. You should be able to see a round hole inside the lens. Slightly tap the side of the camera closest to the lens and see if the hole gets smaller. If it does it means some foreign object is jamming the vanes of the iris. There is little you can do about this unless you get lucky and whatever it is causing the problems dislodges itself. To try to fix it yourself is a very long and involved process. Obviously taking it to a tech will leave your wallet on a diet for a while. So try sitting in a dimly lit room, switch the camera on and shine a flashlight down the lens and at the same time tap a few times. Keep doing this and each time rotate the camera 90 degrees. It may take an hour but if you're lucky the foreign object could dislode and the iris almost close when you shine the light on it. Then you're back in business. GOOD LUCK BMW