Hello, always check for a loose sideplate... field strip the pistol and just reinstall the sideplate, if you can wiggle it back'n'forth on the frame...then,...the same thing is happening when you shoot it! just a plact to start... keep plugging away..you'll be a bit smarter when you done!
Best to all, til...lat'r...GT BTW, My father used to say, " I hit myself with a hammer, cuz it fees so good when I quit!" Welcome to the world of shooter Lugers!!!