Anyway, it is true that the key lock on and off not fast is fast and really put it kostr nerves plates again. Then after a short time the two left hobs have failed and by now the right two. I cook now with the middle plate. I can also confirm that my fields are too close to each other and can not be used simultaneously on two boards left or right two medium sized pots.
For me, the phenomenon is middle plate sometimes simply emanates so. So if I go away and come back time, I do not know how long that had been made.
I'll micht now look for a new induction hob, but Siche just from another manufacturer.