Stuttering kicks in and make some days worse whenever 1.you are thinking about some future ambition which has some temporary hurdles to it 2. Thinking about your past worries like broken relationship, a close family member's unfortunate death or Illiness. 3. Thinking about bad toxic people and wondering how they succeed so easily and getting free stuff and wishing them a punishment in life in your mind. 4. New listeners joined in the presentation like people at higher designation so you may fear them and make your speech too perfect and end up stammering. On other days ,when you don't think/face these above points , you will be mostly stuttering free or very very mild when you do talking in a group presentation.