A mobile processor can handle temperatures up to 100C. You will experience overheating issues if the temperature goes higher than that. The processor will shut itself down to prevent any damage to your computer or it will start freezing or locking up the computer.
A good practice will be adding new thermal material. Please check some troubleshooting tips linked below:
Sorry for the late reply!
There is nothing behind the laptop, it should have great airflow. Also both fans are working normally.
I'm unable to repaste the cpu myself, should i sent the notebook back?
Thank you for the feedback.
At this stage, since this is a laptop computer, the best option will be contacting your computer manufacturer to get information about the warranty on this computer.