I've had a Sky Avenger for approx 2-3 years now and when I first received it had to give it a good shaking to get it going. Tried the winder , the gentle roll, etc. but the only thing that got it going was a fairly good shaking. When I don't wear it and it stops, it's very tough to get it going again and only comes around after a fairly lengthy shaking. I'm not suggesting that this will work for your watches, but it may be worth a try before sending back to China. Just my 2 cents worth. Hope it all works out for you.