Just a thought. Are the drivers applying oversteer out of the corners where there's a wall nearby. Too effectively reduce the chance of an impact, well serious anyway. So they'll bounce the rear-wheel off of the wall and allow a drive away from it.
Very exciting race to watch. Finally have a live timing app working in Ubuntu (not on the F1 website)
"It could be done manually. It would take quite a while, but it could be done. There is however a much more efficient and accurate way of getting the data. Men with lasers." Wing Commander Andy Green