Bought a new Sinn U1 from watchbuys in December of 2013. It always kept extremely good time but the auto winder never worked properly and the watch would die at random points when it was off wrist
Finally sent it in for warranty work this past December and it's on its way back home
Official diagnosis: dried lubricant! Why the heck would a new watch from Sinn have dried lubricant? Is this common with Sinns?
Maybe it was just old stock, but there's no easy way to tell the date of manufacture...very puzzled