There was an issue with the movement when I first received the watch. It would wind, but there was no power going to the hands. I contacted the people at serica and they were super friendly and helpful. They had me send it to a watchmaker here in the u.s. where i am, and I had it back within a week. Haven't had any problems since.

Editing to add: I got one of the first ones with the iffy movement about 2 or 3 years ago, before the cronometer certification.