Anyone have trouble with their 35-70 not wanting to play nice with the autofocus on the G2? I have two bodies, and seem to have problems with each one trying to get the zoom to focus correctly -- it seems to want to keep hunting for focus when I would rather be firing the shutter. Before I send it to Contax to see about getting repaired, I thought I'd ask here. All my other lenses work nicely with both bodies, so I'm sure the issue is with the lens. Thanks.