The docs bot that worked in March is quietly wrong by September, and your logs won't say so. Vectors go stale when documentation moves. kapa.ai calls it embedding rot and puts the shelf life of an unmaintained retrieval system under six months. It answers confidently from the corpus you had in spring, because a stale index doesn't throw errors. Re-embed once 10 to 15 percent of your corpus has changed, and hang the trigger off your docs deploy rather than a calendar reminder. Measure it yourself. Vendor resolution rates near 76 percent count any conversation that ended without a human, which also describes a customer who got a wrong answer and left. I read fifty transcripts a week. https://www.duskolicanin.com/blog/ai-chatbot-saas-help-docs-2026 #AI #SaaS #RAG #SupportAutomation