Quote:
Originally Posted by burnthesehills
...after three or four weeks, the power reserve seems to wind down completely...
..winding the watch until the crown won’t turn anymore...
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That first statement is throwing me a little. To test for sufficient autonomy I recommend winding the watch manually to start/set it (~20-30 twists of the crown are enough), and then wearing it all day (after which the mainspring should be fully wound), and then putting it down for observation to see how long it continues to run. If your watch uses Caliber 8800 then you're looking for ~55 hours.
If you get ~55 hours then it's all good; if you get a meaningfully shorter autonomy then yes, it should be inspected. If it's under warranty then the service should be covered, and if it's not under warranty then I recommend Nesbit's Fine Watch Service. Nesbit's is authorized, prices are typically the same as Omega Service, but communication, turn-around, and quality-control are all better at Nesbit's in my experience.
Your watch's crown won't stop turning when the movement is fully wound. Self-winding watches employ a slip-clutch (I think that's the term) which allows the winding mechanisms (self- and manual-) to keep working even after the mainspring is fully wound.
The crown will come to a hard stop, though, in the hand-wound Omega watches such as the Speedmaster Pro or the De Ville Tresor.
Hope this helps. Let us know how it goes.