Just fired my new Shield 45 PC yesterday for the first time and experienced these same mag drops. I thought at first it was a training issue with my thumb placement but remained puzzled since I don't have this problem with my Shield 9. Once I saw this post, looked at the followers in my mags and saw they were the old style, I knew it wasn't me. New followers are in the mail from S&W as we speak. FYI, I asked Jarred (spelling?) at S&W if I should ask for four replacements instead of two since I qualified for the Perfect Summer Hideaway promotion with this purchase which includes two more magazines. The answer was no, the mags coming with the promotion already have had the fix installed.