Mine is a 12 and only 6 months old. Just under 12k miles. I put in a lot of mileage taking very long road trips. Under warranty of course with the dealership replacing both the master cylinder and csc. I think it makes sense to replace both. It was still driveable with the engagement window at 2 inches but annoying. I'm sure it would eventually fail if I continued to drive. I'm going to check with Zeb at Z Specialty and Lou at Amplified Motorsport for their opinions on this.
I drive it pretty hard but it should not have failed on me this early. Hope they get it fixed soon enough so I can take it to Tony on Friday for the FI TDX NR CF w/ RHFC and drive it to wine country again for some wine tasting