'Stuttering' can also happen when using sign langauges, and it was recorded but I can't cite the source rn but it can really happen. But that is not 'stuttering', and I am more glad to tell it 'jerking'. This can happen among like pitchers, for instance, their arms get frozen out of blue and I think that is what you are referring to.But I can't make sure that that kind of movement impediments is portending diseases that are associated with neurological degenerations, cerebral hemorrhage, etc. So you'd better do physical examinations as soon as possible.