I have an AE1 with a power winder A. All batteries are "new". The thing I'm having trouble with is the advanceing of the film. When you turn the power winder on and press the shutter release it fires but then stops, after pushing the button next to the film winder ( left side of camera the button has a circle with a line though it) it resumse but you have to push the button again after a few frames. dose any one know why this happens ( it happens w/o the pwer winder also)