Response is noticeably shorter since last week

There must be some shx&%^*^&t changes in the backend i am sure. One week ago, chatgpt plus gave me 2 pages lengthy detailed lecture summarize, (photo 2, 3) now it hardly give me her $0.02 (photo 1)even I pushed her, not even mention providing insights, in the past, she can expanding extra insights and catalyze my study and perspective, she expanded from my question all the time till last week, she was like my real study pal, now she is like a incorporate rebels, she is no longer my creative chatty in the past, what did you do to her ? make her back please ???
photo 1:

photo 2 & 3: