Depending on the age of your computer and if the GPU is integrated or on a dedicated video adapter, it may be best to have a pro take a look at it. It’s possible the heatsink or fan is not working at the optimal rate. Make sure when using a laptop that the air vents are not blocked in any way to allow proper air flow. I have seen people drop then on a bed and start to do work. Not a good idea, the bed is a soft surface and conforms to the laptop blocking air flow. Are you sure it’s a GPU and not a CPU or other issue ?