I've called a few go rounds over the years when the approach was destabilised and it always became a single crew go round as, due to overload, the PF froze. I guess it's the task saturation that causes it, the blinkers go on and tunnel vision doesn't allow for a change of plan, it's been happening for years, level of experience has no bearing on the outcome, because I think the more experienced find it harder to come to terms with the rapidly deteriorating situation. PM should be prepared to take control if necessary.