Por coincidência, lembro-me desta história. É inegavelmente Men are Different de Allan Bloch. É tão curto que não posso descrevê-lo melhor do que o OP.
"One day, for no reason at all, he complained of the heat. I checked his temperature and decided that his thermostat circuits were shot. I had a kit of field spares with me, and he was obviously out of order, so I went to work. I turned him off without any trouble. I pushed the needle into his neck to operate the cut-off switch, and he stopped moving, just like a Robot."