I work in a fairly quantitative technical field. We get open projects which I love to do. I do quite well at them, and I have a good reputation in my team. My manager is more operational and most of the decisions are taken by my manager's manager (call her D). So I regularly present/mail my research work to her.
Sometimes, over mail and verbally, she is very enthusiastic about my findings, and she is very liberal with her oral and written feedback.
However, lately, she does not reply to my emails or follow ups. Our calls get canceled and shifted and finally when I get her on call it is clear she is multitasking and I do not have her full attention. Communication is very formal rather than personal.
I am not sure how to take this because I know the quality of my work could not have gone down.
I cannot have these technical discussions with my immediate manager because he is not technically tuned enough to give me useful feedback - to his credit he does not have a problem with this and is very useful in other parts of my job. I have a good relationship with him.