Well the hard reset didn't have any effect mate but I think I've found the cause and it appears to be the Guide button on the controller.
As an example, if I press and hold the Guide on the Settings page, I get some kind of noise (almost music like) before it returns me to the Home screen???
If I press it firmly, and I mean firmly, I then get the option to turn the console off every time???
Its got to be a circuitry issue in the Guide button given I'm convinced it's a controller that's the problem now. That might explain why I was having issues in the Ghosts demo (maybe other circuits aren't working as they should) given I can't find anything online about problems with the demo.
Unfortunately I don't have another controller that will clarify this so I'm going to take the controller back to GAME and see if they can try it on one of their consoles in store.
Gave it a crack, first map looked OK poor water but nice foliage shadows just a nice cod nothing great but that's what I want, clean and smooth.
Second game seemed back to old cod shot in the back split second after spawn, got passed off and left and low and behold host migration,! I thought it was dedicated servers? I know I am on infinity so good to host but still it means I was getting good host raped as per usual. F that for fun, shame as the squad bits they did actually really appealed and was hoping they might win me as I expected the game to be cheap as chips after titanfall so I would not feel bad about buying it.
Ohh well 5 mins and I am back to pvz for my shooter fix.