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You said that it happened both with your new and old computers. Is there anything that you have kept over from your old computer, e.g. components, peripherals, USB stuff, etc? Are any things often plugged in when it reboots? Some PSUs have something like overload shutdown and if you have a dodgy peripheral that is shorting out the PSU (or a mis-rated PSU for the computer, as might happen with an overly powerful graphics card), then sometimes they shutdown (I've had this happen occasionally).
That said, it does also sound like ahammer's suggestion of an auto-cutout due to heating issue -- is there good ventilation around it?
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