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Yeah, mine is smooth now.

I think it is a software thing. I’m using the large font time, and mine is ok.

Weird.
There's no software (or hardware) that controls how stiff the Digital Crown is. The watch face doesn't have anything to with it either. Most likely, sweat and other debris got wedged between the Digital Crown and watch case. Holding it under running water while turning and pressing the Digital Crown is what Apple recommends.

 
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