As a long-time Apple Watch user and tech enthusiast, I've encountered the common issue of a sticky Digital Crown—that subtle resistance or momentary freeze when scrolling. This typically stems from debris or sweat buildup between the crown and case, especially if you wear it during workouts. While hardware wear is inevitable, Apple provides a reliable, official fix that works across all models, including non-waterproof Series 1.

Apple recognizes this recurring problem and recommends a simple water-based cleaning process to restore smooth operation without risking damage.
First, power off your Apple Watch completely and unplug it from the charger. If using a leather band, remove it to prevent water damage.

Position the Digital Crown under a gently running tap with lukewarm water. Tilt the watch so water flows directly onto the crown and drains away, minimizing exposure to the rest of the device.
While water flows, rotate the crown multiple times and press the button. Continue for 10-15 seconds (I extend to 20 for thoroughness).

Dry the watch with a lint-free microfiber cloth, then let it air dry for at least five minutes before powering on. This method effectively clears debris, and the crown should scroll smoothly again. Repeat as needed if the issue returns.
In my experience, placing the watch near shower steam (not in the water) can also loosen it up by reintroducing moisture.

If these steps don't resolve it, visit an Apple Store Genius Bar for a free inspection—repairs are often quick and low-cost unless parts are needed.