OP, how long have you been seeing this therapist? If it is not a very long time (say, just a couple weeks or months), I think it is perfectly normal that your mind migrates away from the momentary connection with someone you only interact with with that frequency. I think it is very common that when an experience/relationship is new, the engagement is fueled by the novelty factor and it fades with time. Not just therapy, it is quite universal. Then, what can probably replace it is if there is interaction that truly touches us somehow, is useful, enjoyable, or otherwise leaves a mark. Simply just talking with an individual as a routine will not create the object constancy mentioned above. Do you find the therapist and what you discuss with him interesting/helpful? I personally don't think that it is essential in therapy to cultivate a steady connection with the T, it actually often creates more problems when people cannot let go and constantly think about the T. Maybe focus on the actual issues you bring to therapy and how you and your T work with them, experiment with trying to improve them between sessions?