laptop cooling fans/pads are almost a must, especially if you are playing 3D games and working the pc overtime.
I dunno if it was an overheating issue or not, but I *have* had "wonky" laptop behaviour (USB ports stop working, wireless quit, etc...) due to overheating before.
Here are some results for laptop cooling fans from
Google shopping
you definitely want one of the pad-like one tho.
I'd expect to pay around $25 for one.
Good luck!