I have a theory re Nico and Lewis.
Lewis has had six fails in qualifying: one was a safety incident at Monaco; three were bad decisions on his part at Aus, Canada and Silverstone; and two were tech failures. Nico, on the other hand, has been Mr Consistency, and he comes over as Mr Cool.
The pressure from Nico and his team is not only on Lewis, but also on his garage. Allied to the fact of the mistakes made by Lewis, and his personality, that pressure must affect the garage and also lead to its members being put under more stress than they need, which could lead to them making mistakes.