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@DFox
The UART issue seems unlikely to me because the Pucks typically run for hours without problem beforehand.
The pucks are not grounded in any way, run from a CR2032, and the thermistor is actually the SR version (so no washer, it's a disc but with no hole) and is taped to a finger or toe. There are 2 wires leaving the puck, attached internally to a 2-way connector screwed onto the puck body. The thermistor connector mates with this.
I did the self test on a bad one, and got:
Pin D30 shorted low
Pin D31 forced low
Pin D31 shorted low
Error code L30
=false
I'm guessing this isn't good.