I have more problem when i give it a lot of thought. Repeating a sentence in my head. When doubt enters my conversation my speech wavers. This is why confidence is key and mental health plays a factor. My brother a non stutterer, stammers when he has a very busy day and has to preform at the tables explaining what the dish contains, ingredient wise. I on the other had. Lose my stammer when i have to think about a million things at the same time. And thus blocking my thoughts i have a stammer. Because i don't have any time for it. Which makes me fluent. Edit: I find that not giving a crap helps. It stops me overthinking things and just be me. As a result my stammer decreases.