Never had that problem with my Navi World but you are wise to be careful. The boutique set the watch to local time, so I assume they moved the time on at the position 3. It maybe a little stiff being new, but if you feel it is too high on the tolerance side perhaps you can drop into anther AD or back to the boutique and ask them to check it. Not good for wherever you are at the moment, but might be best to be careful. Can you time yourself some other way until you get back to a dealer?
I know this sounds dumb, but remember the watch is new to you and I would check that the position 3 is actually the second click out for the crown. It does not go any further, so are you there already and you just might not know it? Pos 1 is against the case, 2 is the first click out and 3 is the second click. You have already changed the date so you know where pos 2, are you sure you are not at pos 3 when the stiffness occurs? To check, just wind the crown and see if it moves the hands. Told you it was a dumb thing for me to write..........