I always failed at end cus of those watching on timer, kind of reflex. But once I drop on head to dont do that I won over that stuff xD
Another thing is when you did a really great run and you are close to finish, your brain says stuff such as "if you fail now, you'll f@#! up your best run on life, so you'll better dont" and thats make your brain to do save finish as possible and on the same time your hands still going fast by enertion. Its all about psychology and its kind of problem that are hard to beat