Yes, same problem here developed after about 150 rounds. Both magazines and frequency is getting worse. Definitely not me. At first I just thought I may have hit the mag release or maybe did not fully seat the mags. I verified mags were in and engaged, watched to make sure I was not hitting the release, shifted to one hand only, and they still drop. My first S&W product, so not a good start. A google search revealed the same issue on the .40 Shield on this forum a couple of years ago. I'll give them a shot at making it right, but my confidence in it for CCW is greatly diminished...and CCW is the whole purpose. It shoots and handles well, but mag drops which also causes a difficult to clear FTF will get you dead.