I have had a similar experience several times. Cutting the story short, I have noticed that it happens when slowing down or braking and the speed gets so low to drop the revs. below the normal 'tickover'. (normally you would feel the emgine labour before stalling , but it is very difficult to 'feel' that happening, probably because the roads are so crap!). Did it today turning into a car park and thats what I noticed. I too am 'old school', as we are not used to synchromesh gearboxes in first so tend to not drop gears down when it seems the engine doesnt like it. Well thats my theory for what it's worth. Might be useful to take notice when it happens and report it on here to see if anyone agrees. Skoda dealer will be a waste of time at this point I reckon!