Karok Idle moments

Since September my Karoq 4x4 SEL DSG reverts to idle mode and then the throttle has no effect on the revs,regardless what I do with the lever.  It does this when manouvering. For example, leaving a car parking spot to get onto a main road and stopping to see that the road is clear and then accelerating, if only.  All I get is nothing, no increase in revs no matter which slot the lever is in.  This has now happened 8 times since new in September.  It get even more exciting when it happens and I am in the middle of a roundabout.  It has been to the Skoda dealership twice for a full reset and test, no problems found.  Now my wife will not drive it and who can blame her.  One theory is that it needs a replacement brake switch this was from a VW engineer who said that they are unreliable.  I must read up on how to reject a car.  It went in on this Wednesday and the same thing happened on Thursday morning.  Thought would be appreciated