Watch Stopped Running. Any ideas before sending it in?

[Jeffreyc87]

My four-month-old subc has been running perfectly.

It was still running when I attempted to change the hour (moving it ahead for daylight savings).

When I pulled the stem out to the very last position, in order to move the hour hand one hour ahead, once I pulled it out to the final position, it sprung back in to the date change position.

So I pulled it out again to the final position to change the hour and pushed it all the way in.

I noticed now that the Watch has stopped running.

I was pretty gentle with the stem and all the positions seem to work smoothly including the date change.....it's just that the watch will no longer run... I have wound it.

Any thoughts before I send it in for service