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The article reports that infinite thinking loops in Laguna S 2.1 AI model are likely caused by quantization artifacts. Switching to an MoE-aware APEX quant (e.g., Myric/Laguna-S-2.1-APEX-GGUF) and using default sampling settings (temp 0.7, top_p 0.95, top_k 20) resolved the looping for most cases. Additionally, framing prompts around tool calls can prevent overthinking.
User observes Qwen 3.5 falling into repetitive thinking loops during generation.