Yes, its a known fault, I had it on my 2015 2.2D 175 sport-nav manual. 6th gear at 70mph, give or take a couple, you can stop it by resting your hand on the gear lever. If I recall correctly, it requires a small mod in the gearbox, involving replacing a shim? Unfortunately, I don't have the paperwork for that car now, that's as much as I can recall.
Alan