From what you’ve said elsewhere it likely is your HDD but it’s still good to take a look at your thermals. In HWInfo click the ‘Sensors’ button. It’ll bring up a fairly long list of different readings covering power usage, utilization, temperatures, and more. Scroll down until you see your CPU and Core temperatures. The 12th gen Intel CPUs have a max temperature rating of 100C and will cut power and clock speeds if that ceiling is being hit. If you see any cores bouncing off that number (or close to it) when under load you have a cooling problem. It should usually be much lower than that though. Depending on your ambient temperature, case, and cooling solution it could range anywhere from 25C to 50C at idle. With any minimally decent cooling setup and while under heavy load 80-90C can be considered normal but a good cooler will usually keep you under 80C, sometimes significantly.