Hello! This is currently kind of happening to me. I believe it's from practicing so much to prepare for these big "events" that I've got how to say the words down and have practiced my intonation for the hard words, so i dont stutter. If I don't put the same energy into remembering my hacks for conversation level words, I begin to stutter and get stuck again. At times it seems like a full time job working on speaking without stuttering. I know when I begin to stutter again I need to slow down and remember all the techniques I've learned.