Thanks for the details! This is definitely critical with your demo coming up.
From what you're describing, this could be:
Transcriber service issue on Vapi's end
Webhook/streaming interruption
Message batching bug
Quick fixes to try:
Check Vapi's status page for incidents
Switch transcriber models (try Deepgram Nova-2 or Gladia)
Test with a fresh assistant to isolate the issue
Since this is urgent, I'd be happy to jump on a quick call to diagnose this faster. I've dealt with similar Vapi transcription issues before.
Feel free to message me directly if you need faster 1-on-1 support 👍