Pay attention and see if it is the same magazine that jams all the time. Could be a weak spring.

limp wristing it is not holding the proper form, not holding the pistol right..... Basically you would be not holding the frame of the pistol hard enough to allow the slide to cycle right....the whole pistol recoils back instead of the slide slamming back and properly loading the next round. It's common with new semi-auto shooters.
-Jake