This isn't a problem, rather a solution. I have a MAX 6675 module connected to an stm32 development board which at the beggining it worked perfectly and suddenly, it just showed 0C and 32F. Always those values.
Then to try in a different board and program, I've used an arduino UNO and the adafruit libraries for this module. The same results.
Wandered around the internet with many people who was with the same problem, but no responses.
Suddenly tried to solder all. Stop using dupont cables. And it worked again. So, this is for all the people who are in the same situation, use the solder!!
I'll be posting this on reddit to