AI Assist retrieval of KB or uploaded FAQs (RAG) failing since 2 weeks

[apidocs]

hi, i monitor the escalation/handoff rate of the AI assist on a weekly basis and saw a significant drop from 35% to 50 % starting 2 weeks ago. A deepdive into those chats highlight that in most cases when AI Assist claims not to have any resources/knowledge available to answer a question, actually a KB article or a uploaded FAQ exists for the topic and that it can be found via keyword and semantic search (in my local vector store). Did something change in the setup how AI Assist is performing it’s own RAG? How can i optimize how AI Assist leverages KB and uploaded documents?