Some users have reported that the Apple Watch’s digital crown has become “sticky.” If your digital crown isn’t operating smoothly, Apple recommends rinsing the Apple Watch under running water for 10 to 15 seconds, turning and pressing the digital crown to free it up. If you have a leather band, be sure to remove it first, and don’t use any cleaning products on the Apple Watch. follow link
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Cleaning a Sticky Digital Crown on the Apple Watch