I have similar experiences, I believe. Most of the time when in therapy I am fine other than I still struggle to cry. It is worse with teletherapy. However, on occasion when we go into deep discussions about my trauma I on occasion freeze. I can here T talking but I freeze up and cannot talk or really process things. She then starts to ask me questions and to do various grounding techniques. I cannot verbally respond to her on occasion I can shake my head no to tell her I cannot do what she is asking. Eventually I am able to come out of it and we process. We have discussed this. She said for me it is a form of dissociation that happens because in order to survive my childhood I need to numb my feeling. For many years this worked for me. Now I am in the place where I am starting to try to feel emotions but the traumatized part of me is still overwhelmed by emotions especially when it relates to my trauma. In person T has been pretty good at recognizing when it happens and can often do some grounding before hand. It is much harder for her over the computer. She also believes it is progress for me, as hard as it is.