Frames dropping mid-game

[widowsgaming]

So my Asus ROG Gl551JM will run games just fine, until I've been playing for awhile and the frames suddenly drop to unplayable. I've had the laptop for a few years now and I think the problem is that my fan is busted and not cooling my laptop sufficiently, so the cpu decreases performance to not damage the laptop. Am I correct? because I honestly have no clue. Thanks in advance

 

[Cioby]

Dust and cooling is a problem for laptops. Just use EVGA precision or MSI Afterburner and check your temperatures. If they are way too high, like up to 85 degrees, yes, that's the problem 100%

Generally it's good to clean your PC of dust. I'm not sure how easy it is to change thermal paste in laptops, but you can youtube some tutorials and see. Thermal paste helps a lot too, also buy good thermal paste, don't be cheap.