it is because at some point the machine was exposed to high temperatures, damaging the temperature sensor
This could actually be true. My 2nd T17+ got broken a minute after i tried to overclock it. Worked fine for 2 months before that. So please do not go over 800 Mhz on default cooling.
but is it also possible that if one fails it will send incorrect information to the other 3? I don't know, as I mentioned before I have no technical knowledge of electronics and I don't know if this is possible.
It is possible if 1 chip fails then the whole chain fails. Also if your machine works normally in cooler hours of the day, try lowering the frequency.