For now my advise is to examine Event Viewer: Application, Security and System.
Trace what was running at the time of high CPU and overheating.
If your PC was running Windows Defender, Antivir or other Virus Checkers and in the process of installing Windows Updates all at the same time (usually after an overnight shutdown and a cold start in the morning), than this this will surely rev-up the CPU and may cause overheathing. These processes are all competing for resources. Stagger these processes over the day. As you have SIW installed, check the Throughput Traffic, and which processes are running.
Also, ensure nothing is blocking the air intake and exhaust (tablecloth, too close to desk or wall).
Check that fan for ANY play, replace if needed.
Check if the intake/exhaust really functional by hanging a sheet of paper in front of the ducts. I have a brand new Laptop and found the Intake was 50% blocked by a Factory Installed piece of plastic. I still wonder what the purpose was!
Meanwhile, I have installed SIW on three PCs. It kept me happy for a couple of days. Thanks for the Tip.