Ours seems to have recently started this (ther has been a def change) and my older DS and younger to a lesser extent have fallen foul of it.
I am not saying that disciplining is easy. However I am not convinced that this is the best way either.
DS1 is in Year 6 and I have told him to put his head down and just try to get on with it.
He is a very bright child and is bored stiff at school. Not that this excuses bad behaviour of course. But they are jumped on for anything - being a few seconds late, putting up hand and saying a teacher's name in test situation (this was another child, missing play to retrieve a ball from an out of bounds area (that I consider to be a worse offence).
Teacher pulled four boys out of class and phoned each parent, made the child speak to each parent. They had been pulling faces at each other. This of course is disruptive but so is the other course of action.
The school have written to me but have not come up with any specific incidents.
One example of it is that my youngest DS was jumping up and down in the lunch queue, was told off for it and had to miss his play.
He is not often in trouble btw.
I wonder if I am out of touch with modern methods. As I said there seems to have been a sea change in the place and it is not the happy place it once was imo.
it has a fantastic reputation btw