Gulp. My SD43 - only lightly worn in a rotation, babied etc - has suddenly developed an issue with the crown. It's always been buttery smooth and I'm careful to stop screwing it down at the point of resistance, and not to over-tighten it. But yesterday - after winding and setting it, both of which functions were fine - the crown suddenly felt very stiff and resistant on closing. I nervously undid and redid it a few times and it seemed to get worse; now there's enough resistance to discourage me from even trying.

The watch mechanism itself appears fine. It just seems like a crown / thread issue.

Obviously it's under warranty. I was wondering, is this the kind of thing that Rolex St James's might be able to attend to if I wander in? It would be good not to have to be without it.