My shield 45 has the same issue of the slide locking back when the clip still has rounds in it. I have returned it once to S&W with a full description of what was happening. They returned with no repairs being performed stating they put 5 clips thru it and could not reproduce issue. I got it back and went straight to the range where it did it 6 times in 5 clips. It is now back at S&W. I agree that if they can't fix it, it is a nice one shot gun because it is not dependable if I am forced to have to draw and use it. Hope they can fix it because for the most part it is a great gun.