Kernel power 41 just means the system lost power. Flick the switch at back of pc for example will show this error.
Could be a power delivery issue, i.e. a problem with the PSU.
Yeah that was my initial thought too after googling around, PSU is relatively new, about a year old, EVGA supernova G2 750W.
It is so random though, it could be fine for months and then I could get 1-5 of those system crashes in the space of a week or 2