I don't think I'd go so far as to call the Xhaka goal a de gea mistake.

[Burney]

If it's true that both aircraft exhibitied the phugoid activity a la AF447, as reported, it would definitely point to a software or pitot issue. That's a pretty big 'if', however, and ignores the mountains of other possible evidence which might reveal the truth.

Oooh, I like 'phugoid'. I'm definitely going to use that at some point.