Took mine to the range the day I bought it. Fired well until round 48. After that it dropped with nearly every round. As others have said, I tried to adjust my grip and evaluated whether it was me or the pistol. Even one-handed with my thumb partially off the grip the magazine dropped. Sent it back to Smith yesterday, as that is what they recommended. Looking forward to hear how other members' repairs went. Maybe we'll need to start a thread dedicated to members who have had their Shields returned after "repair".