Hi Dennis, i’m experiencing the exact same problem, and i received it from gearbest too (after a looooooooong wait).
It’s keeping shutting down after less than one of normal usage (no games)..and is definetly not a temp problem because it dies when is still cold.
I don’t know what to do because i don’t know where the problem comes from. I hope i won’t have to send it back to gearbest.
Any help appreciate, thanks!