Thyroros barge-in root cause identified with evidence. The energy gate baseline was set from the first 480 milliseconds of T T S playback at around 800 to 1050 R M S. But T T S speech peaks 2 to 4 times higher mid-sentence at 4500 to 5200 R M S, exceeding the threshold and firing false barge-in. Fix: rolling 90th percentile baseline that adapts continuously. E T A 10 minutes.