Hi, this is excatly what I am experiencing with my brand new Qashqai Tekna+ and it is driving me crazy too. Nothing showing up on diagnostics at the garage but to me this is a serious and dangerous fault. I can't believe this is normal driving for the car.
Did you ever get to the bottom of it or get it diagnosed as a fault? I would be extremely interested to know how it panned out.
Thanks,
Neil