#1 your mag springs are junk. I know it's new but the springs are still junk. Get some new Wolff springs for the mags. #2 Sounds like your return spring is to stiff and is running the slide faster than the mag springs are getting the bullet up in position. Buy a new return spring about 2lbs lighter than what is stock. Were talking about $20.00 bucks or so. Try the mag springs first. May cure the problem if not change the return spring. Don't use +P ammo for awhile and if you do have your heavy spring with you.