My first thought is that you have a program running that is putting your CPU usage at a very high level. See if you can run a resource monitor to show you what is using your components so heavily.
If you keep the laptop in a dusty location or use it on a blanket that can allow fuzz to enter the fans then they could be clogged preventing proper cooling. Follow the guides on this site to show you how to take apart the laptop so that you can clean the fans and air intake ports.
If the resource monitor really high CPU temps you may need to reapply thermal paste to the chip. Again follow guides on here.
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