If your HSP06F1S4 features an "Eco mode," lower heat settings, or an auto-shutoff timer, make use of them. This allows the device to cycle on and off rather than running hot continuously.

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If you have a circuit board in hand with a suspiciously hot HSP06F1S4, follow this protocol:

A dry or cracked solder joint increases electrical resistance at the pad level. This resistive hotspot can melt the plastic encapsulation of the HSP06F1S4. Fix: Reflow the solder and inspect under magnification.