Is there any reasoning behind stuttering of specific words?

Is there any reasoning behind stuttering of specific words? Truth be told here I don't know all too much about how stuttering and all that actually even works, despite having the problem my entire life. I suppose it's mostly comparatively minor which may be why I never looked much into it. But there are very specific words or positioning (if that makes any sense) of the word that screws me. For example, if I START a sentence by saying "I....", or say it after a brief pause in a sentence, I almost am guaranteed to stutter "I" about over half a dozen times, just about every single time. It's very consistent and I have no idea why, because some words are fine, and some, like this, I trip myself up over constantly. So what I'm mostly curious about here is, is there any like, actual reasoning behind specific words or placement of certain words causing a stutter? Or is it mostly just random and/or conditioned from it happening frequently over a long period of time?