Golf Mk6 TDI brief loss of power downhill

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I've had a manual TDI 140 for a couple of months now, and while generally very pleased with it, I've noticed an intermittent brief loss of power, mainly in 4th gear lowish revs, when the road dips downhill. It lasts maybe a second or so, so is not dangerous, just annoying. I've searched google and read of a few others having similar problems, but all seem to have been told by dealers that there is nothing fundamentally wrong. Has anyone here experienced this and had a fix?

[adamb]

Thanks for the replies. Seems a shame that a car that is otherwise so well made has such a common and irritating flaw!