I have the problem. Contacted S&W and they said they would send a replacement magazine catch. When it came, it was obviously not a proper fit and worked no better. When I contacted them again, they apologized and said they had sent the wrong part. They had me return the gun. They said they were still working on a proper replacement magazine catch and told me it would be a while before it was finally produced. They estimated it would be about four weeks before I received the gun back. They are now very aware of the problem and seem convinced it is the magazine catch. I agree since my magazines were never fully seated.