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No, that is not to be expected, so we should troubleshoot it a bit. This part:
There is reason to suspect the VAD of being out of sync with the current background noise levels in the environment so we will recalibrate.
Should only happen if there is a significant difference in background noise all of a sudden, for instance if you are performing recognition at the same time as music is playing or other ongoing and/or escalating background noise, or if there is something peculiar happening with a lot of suspend/resumes. Can you tell me a bit about the circumstances of the recognition? Does it differ from the circumstances in the sample app, and if so in what sense? Is the app having trouble detecting an end to the statement?
This score is also of interest:
It’s a notably lower score than I would expect to see as a correct recognition. Is it correct? Is anything interesting about the audio setup?