Yes, I had a fault in one of my cables a few inches from the end due to lots of use over time. It was intermittant for a few shows then worked great for several until it went out completely during a show. I sent it in and they shortened the cable to eliminate the break and shortened the other one to match. Your issue might be different, but think being suspicious is the right thing. If you didn't find an obvious cause I think you should try to duplicate it before declaring victory just to be sure you don't have my experience.