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Optical modem overheating is not the same as router overheating; routers complain about lag, while optical modems speak about light degradation. My weak current box feels hot to the touch in summer, with light degradation climbing from -21.8 to -24.6, and the network speed dropping to 760 Mbps. I tested all three cooling techniques one by one. When the temperature drops, the light decay really returns, and you get a good idea of how much each move lowers....