My AW2 and AW3 both stick regularly. After runs with the AW3 I've just started rinsing the crown with warm water while pushing and turning it for 10 seconds or so. Seems to keep the sweat from drying and causing the problem.
If you rinse it under water while turning it should instantly go back to normal. If not you might want that have Apple take a look at it as a few seals have worked their way loose in some threads here.
My AW2 and AW3 both stick regularly. After runs with the AW3 I've just started rinsing the crown with warm water while pushing and turning it for 10 seconds or so. Seems to keep the sweat from drying and causing the problem.