I can definitely agree with that statement! Whenever I used to work as a cashier at a supermarket I found that saying fifty to fifty-nine whenever I was working would usually make my stutter come up, and I would hit a brick wall. Then I would have to go through my process in front of the customer (so embarrassing). But I have found that when the day was really busy and the fact that I had been doing the job for awhile I go into autopilot and don't stutter the entire time. I think this is because we start to go through the motions, and since our brain starts to see the patterns for the job we have you just bypass your stutter. But it comes straight back if you think about it. So sometimes it helps to just be on that autopilot mode.