I don’t know what happened to the twist lock. Some say it’s the oils on our hand, but I rarely use this bag. I never had any problema with the rest of the bag hardware. And I never encountered this on my other bags. I got it 2016, it’s an ML flap. Can this be fixed? I’m scared on wiping it with anything. It’s rough to touch, like it corroded or something. Any suggestion? Can boutiques replace this? Or even take it for repair?