The hand over the mouth has a positive intention. Is it intended to conceal your mouth mid-stutter? Do you also look away from your listener at the same time? In learning from your 'brain shift' I wonder if your unconscious mind is thinking about a conversation, call, meeting, or such that you predict stuttering in. Doing some voluntary stuttering (VS) early those mornings would really piss off the authentic stutter :) VS would allow you to stutter freely and without worry. Otherwise it can be a self-fulfilling prophecy of: "oh great I just had the first block I was dwelling on....now it will set in all morning or all day....I have lost control today." Consider calling a business early those mornings and asking "w-w-what time do you close?" Cheers,