I have a Asus Laptop with a NVIDIA GeForce GTX 260M graphics card. While playing any games, I get random lag spikes that I either have to restart or wait a while for it to subside. My GPU runs at a highest of 80 degrees Celsius while playing these games. I do not think it is overheating but I do not know for sure.
I've never had this problem until recently. I have played these games for a while. I'm currently playing Empire: Total War, GW2, and Rust(newly installed). It was doing it before the rust install a little too.