It might be fear of judgement that’s causing your subconscious to go into freeze mode. It might’ve started because of the perceived importance of the speaking situation (meeting or presentations at work). If this is the case, you can actually try to voluntarily stutter a bit during these situations to signal your mind that stuttering is not a big deal, and that ‘it’ should not fear it. You are perfectly capable of holding your own during these meetings as evidenced by your past actions. So you just need to assure your subconscious that you’re capable of expressing yourself regardless of whether you stutter or not. When I have big presentations in front of hundreds of people, I tell myself over and over ‘it’s ok to stutter, no big deal’, many many times until my stupid subconscious actually starts believing it lol. This actually helps me speak freely, regardless of whether I stutter or not. Another important point is not to beat yourself up after a speaking event. Beating yourself up, feeling guilty and remorseful about your stutter will only reinforce to your subconscious that the idea of speaking is a scary situation.. this will cause it to induce more freeze events in similar situations in future