I recently had a nice conversation looking for some reading suggestions from an LLM. The first round of suggestions were superb, some of them I'd already read, some were entirely new and turned out great. Maybe a dozen or so great suggestions. Then it was like squeezing blood from a stone but I did get a few more. After that it was like talking to a babbling idiot. Repeating the same suggestions over and over, failing to listen to instructions, and generally just being useless.
LLMs are great on the first pass but the further you get away from that they degrade into uselessness.