things always go wrong

I might call it, Pear-shaped: Why Things Always Go Wrong at Work, and How Not to Cope When They Do.

要是我写书名字可能会更婉转一点：为何工作老是不在状态，怎样改变这个状态？

When John tells you he got mad, you're not surprised, because he always gets frustrated when things go wrong.

当约翰告诉你他生气了，你不会感到惊讶，因为他总是在事情出错时感到沮丧。

Things kept happening that he wasn't expecting, and they always seemed to go wrong at 5pm on a Friday, or just as the team were starting work on an urgent order.

出乎他意料的事情不断发生，而且在周五下午5点钟的时候他们似乎总是会出错，或者是当团队开始赶一批加急订单的时候。