On further viewing in slo-mo it seems that afer MaxQ there were a series of failures in the engine bay resulting in at least one thrust-plume or combustion jet ejecting way off the axis. I'd guess they had a series of big engine failures each triggering the next with debris/shockwave until enough damage was done to compromise the control system.
They'll learn. But I reckon it'll be a while before the next attenpt as those engines are clearly not up to scratch.
Early days yet. They'll get there, of that I have little doubt.
It seems Twatter has a useful purpose after all!