Laptop keeps failing even after multiple motherboard failure

I have bought a laptop few months ago and within 3 months of purchase I have undergone 3 motherboard replacement. I just found that others have raised similar issues about this model of the laptop. The technician send by the company do not have any idea of what's wrong with the laptop and the company keeps dodging my questions regarding the cause of this issue. Now I am running on my fourth motherboard and it is working fine as of now. As soon I got the 4th motherboard I did some stress test and found out that my CPU is running at 100 degC on two cores of the CPU which is unusual. I have raised this with the company and there hasn't been any update from their end. I have seen some YouTube videos that suggest to undervolt the laptop and it seems to have fixed the issue. I know this is a temporary fix and once my warranty expires and then I face a motherboard failure i may have to pay from my end for the deficiency caused by the company. I have a video recording of the technician stating that there wasn't anything that got burnt or there was not water damage to the motherboard. This was my dream laptop and I bought it with my salary from my first job and I was devestated that I may have to live with a faulty laptop that keeps on failing an I am scared to push the laptop as I fear it might fail again.