I've had a similar issue with an older laptop, although for me, this happens during any type of usage, not specifically gaming.
I'd checked the crash logs, done memory tests, updated/rolled back drivers for various components, performed a fresh install, cleared out dust, repasted, everything I could think of. I'd observed this crash happening from time to time, but couldn't recreate it myself. The laptop could go a month without it happening, or it could happen twice in two days. It happened on battery power, when plugged in, or when charging - totally at random.
It's probably not what you want from this post, but I never got to the bottom of it. I still use the laptop and turn the power off/on when it happens - perhaps on a 11 year old laptop, its just some component aging and being unable to provide a reliable voltage...
Well done sorting it!