Static discharges could be an issue... capacitors can help, worst case you have to add 'transient arrestors'... but from your setup I would expect that nothing ever can touch the blank wires of your thermistor.
Sinc you do not show any code, it is difficult to make some comments about why a puck would completely crach. I could think of some issue in setTimout() / setInterVal() usage that could lead to buffer overruns. But that is a wild guess...
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