Hello everybody, I have an Omega Aqua Terra with Caliber 8900. Sometimes, when I move the crown to its first position (hour hand changing position), the crown doesn't move all the way, it moves half the way. Trying to set the hour hand with that half position makes the hour hand jump forth and back from its current positions. It's like the hour hand is trying to make the jump to the next position but failing and setting itself back to its original position. Pulling the crown again, and setting it rightly to its first position fixes the issue, and the hour hand can be changed properly. It doesn't happen all the time, but at specific moments. What kind of issue is this? Do I need to send my watch for service? Thanks.