Just purchased a new Shield for CCW and I noticed something I think is off (or maybe just a quirk?). I shot the first mag, ejected it, put in another mag and went to hit the slide release and nothing. I tried again and nothing still. It is so stiff to the point that my thumb is red before it will release and not always does it even then. Anyone ever had similar problem? Love the pistol and how it shoots. Of course I could just slingshot it but that's not the point. It has a feature that isn't working. Any ideas?