It is very hard to relate to this specific case until we know the cause. However, your experience is not unique, power consumption and buggy graphics drivers is still very much a challenge on linux. It just underlines that linux is not ready for the desktop yet. I am very happy to see the progress done on both accounts the last years, so I do believe you have been a bit unlucky (whereas just four years ago your issues was very common). In any case, the year of the linux desktop is still not here, and we all need to be patient and keep focussed for yet some more time to iron out the issues.
In the mean time, consider wasting some time hunting the causes. If the machine is overheating prior to reboots, that should be possible to monitor. It should also then be easy to locate the sinner (i.e., is it CPU or GPU, is it a runaway process or a GPU driver issue). Distro-hopping may or may not be a solution here. Your hardware is brand new, so you probably need to go with a fairly bleeding distro anyway. In this case Ubuntu 14.04 is as good as any other (and no, I am not saying this as an Ubuntu fanboy if anybody got that impression).
In the mean time, consider wasting some time hunting the causes. If the machine is overheating prior to reboots, that should be possible to monitor. It should also then be easy to locate the sinner (i.e., is it CPU or GPU, is it a runaway process or a GPU driver issue). Distro-hopping may or may not be a solution here. Your hardware is brand new, so you probably need to go with a fairly bleeding distro anyway. In this case Ubuntu 14.04 is as good as any other (and no, I am not saying this as an Ubuntu fanboy if anybody got that impression).
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