Hey guys im I the New Xbox Pme Experience and for some reason playing TMCC idles my system then it turns it off. It happend while playing Halo Anniversary then I changed to Halo 2 Anniversary and it happend yet again 3 times mind you and at one point I pause the game and snapped my tv and it errored a few times until it resumed then turned off my system.
Might be worth making a post over on the Xbox Preview Support forums, they’ll have a better idea of issues in the latest preview builds of the X1 OS 