It seems that: 1. Vapi does not trigger the tool call from time to time 2. Vapi does not get the webhook message after the tool call. We have seen it got stuck on various tool calls that were successful from time to time. Same tool can succeed on the first try and fail on the second try in the same session. We have tried half a dozen different models, gpt4o, 4.1, 4o Cluster, 5.0, Gemini,