[OHNE G-Nachweis]
There was a piece at the back, that was moving around when I was shaking the watch, or just walking with them and then this piece just fall apart and it's just loose now. 
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If you look at the back of the case you can see that automatic winding mechanism is broken. 

Also in past I've had a problem with "day of the week" every week it was one day up. Not a big deal, but still something.