Hi robinette,
I have the same watch (leather strap version). It shouldn't stop working after 3 days (assuming you don't sleep for 3 days

I am a "office-guy", so movement of the wrist is rather limited, still no need to wind manually. Power reserve is 55h on my watch.
When you wind the watch manually, how does the rotor behave? I see mine moving slightly at start of a turn on the crown. Also, when you turn the watch itself, does the rotor move? If you experience any strange noises or the rotor looks "blocked", bring the watch to an AD to have it checked.
Hope this helps...
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