Well. I can't tell if this is throwing good money after bad, or just weird money after OCD. But I need a differential voltage probe and a current probe if I want to continue down this ESD rabbit hole. I think there's some real need to Just Fix It.
Maybe you need common mode protection, then, too: perhaps take the pair of thermistor wires and run them through a toroidal core several times. But differential mode protection (the big capacitor) still seems indicated.
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This specific issue was adequately fixed by shielding. FWIW, the thermistor input is already protected by multiple ESD diodes and capacitors. My guess is the ESD protection simply overwhelmed the ground sink capacity.
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We do want to be able to put all that energy somewhere and not bottle it up as it'll pop out somewhere else. Signal ground was just apparently not a big enough place.
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