I have shut down in therapy. The therapist usually sees it coming and says "stay with me" or "don't go anywhere" but sometimes it still happens. Sometimes I'm aware of it, but just gone mute, sometimes I'm not, and come out of it on my own. Sometimes the therapist talks through it, but usually, silence. Oftentimes when I check out it's when I've been asked a very difficult question I don't want to answer, or when a topic is brought up that I think has been beat to death. For some reason, it only happens in the last half of therapy. Never the first. There were a couple times where I dissociated, and when I "came back," I got up and just left. I don't know how to control or change it, I still dissociate now as much as I did three years ago.