can flashlights overheat and turn off automatically?

Yes. High-power flashlights may overheat and shut off automatically due to built-in thermal protection. It is a safety feature, not a fault. It will work normally again after cooling down.
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365nm vs 395nm UV Flashlight: Which One You Should Choose

黑光 UV301-395nm 紫外线灯 AA 电池黑光紫外线手电筒,用于紫外线胶水固化、岩石和矿物鉴定、荧光剂、宠物尿液、污渍检测、交流漏电检测。

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