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A practitioner compares Qwen3 27B running INT8 vs INT4 AWQ over two weeks of heavy agent logs, finding INT4 dramatically increases reasoning-loop rates (1.9 vs 4.7 loops/1k calls), cuts task success from 92% to 78%, and the gap widens at long context above 100k tokens. INT8 and even BF16 also loop, so quantization amplifies rather than causes the issue.