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I've heard of similar issues over on the Support forums. I had my console shutting itself down ...
Is it restarting randomly or is it happening about every 1 hour? I ask because mine kept turning itself off on the hour, even though I was using it I believe the console thought I was idle and it shut itself down.
If this is the case look in the settings and disable .... "Automatically turn off after 1 hour of inactivity" ...
I know this is slightly different to what you are having, yours is restarting, mine just shut itself down but might be worth a try.
Has this started happening recently or did you basically just get your console?
Just asking cos when I got my console it was -15 celsius around here and it took like 30 mins before the device was warm enough so that it could boot itself up, before that it would instantly turn off again when I tried to turn it on.
Byt obviously if you've had it for longer than an hour the problem isnt likely about this :P