I don’t have this issue but have heard of it before. My friend who stutters says he physically cannot fart while other people are around. And I have similar issues such as when I’m spray painting, my finger sometimes freezes up on the cap if I feel I’m gunna make a mistake. It’s because stuttering can be very related to inhibition. If you feel like you have a reason to not say or do something, then our brain inhibits us from doing it physically. Speech is just one part of the manifestation of this inhibition. So you could say that you have a stuttering problem, or you can reframe it and say that you have an issue with your body manifesting inhibition physically. That’s why it’s best to push ourselves everyday out of our comfort zone so we can feel safe and not inhibited in various aspects of our life. I could get more into this. Let me know if you want me to share more of my thoughts on this.