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

[Sir C]

As our resident aviation expert what’s your take on this 737-8M business? Seems like there’s something wrong with them, no?

Two in a short period of time, both allegedly displaying verticsal speed irregularities shortly after departure... it certainly sounds suspicious, doesn't it? However, these things are rarely, if ever, as simple as they might appear at first glance so I wouldn't yet jump to conclusions.