I have a Model 27-2 that I purchased new over 30 years ago. For some time, while you pull the trigger rapidly in double-action, the trigger will lock-up and you can't pull it. Usually when I release the trigger and pull it again it will work again. This does not happen often, but often enough that it bothers me. Does anybody have an idea as to what may be causing causing this? I contacted S&W and their customer service people told me it would be 6 or 7 months turn-around time if I sent it to them and that is not acceptable to me (whatever happened to their excelllnt customer service?). I have no gunsmith in my area that I trust. Any help or suggestions would be appreciated.