The symptoms you describe are called "short stroking." The slide is not going far enough back.

Frequent causes a shooter can address are:
1. Wimp ammo. Get a 124gr quality brand and see if problem goes away.
2. Incorrect grip for type of gun. Have experienced "plastic fantastic" shooter try it.
3. Wrong recoil spring. Put in standard spring (factory might have made mistake).

If that's all been checked, I'd call S&W customer service warranty number.

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Science plus Art