I bought a watch from the Swedish Groupon.se named Theorema Paragon. It has worked well until now when the second hand has started to fall behind. If I hold the watch up side down, the second hand stops completely. It will then start again after I turn it around.

The second hand also falls behind even when it's not upside down. I put the clock to 12:45. 15 minutes later, the time was set to 15.57 when it should say 13.00 according to my computer clock.