I had the opposite experience many years ago when I tried to join the air force. My stutter can range from very severe to non existent and there doesn't seem to be any rhyme or reason for why I stutter. I can be completely relaxed and confident and I'll stutter like a maniac. I can be under a ton of pressure, nervous as hell and I'll be fluent. Other times it's the exact opposite. When I was taking my physical for the air force everything was fine. I was talking to doctor speaking perfectly fluently and I told him about my stutter. He had me read something so that he can guage how severe my stutter was and I was stuttering on every single word, which disqualified me.