I tore the watch down to look at how the buttons work. While the others distinctly click, the middle/crown button felt mushy. I found that if I applied pressure to the circuit board while pressing the crown button, it would click. I put the watch back together and found this to still be true. When the crown button doesn’t work, if I squeeze the watch, face to back, and at the same time press the button, it works. Not an elegant fix, but it works.