Check the settings to see if there's anything that would control that feature, and could have possibly been changed by accident. Since the button still turns the phone on/off, it tells me that it's not faulty, and the issue is on the software side of things.Just wondering, I used to be able to hold the side button for 3 seconds to access settings (and shut the watch off). Doesn't seem to work anymore, just turns the screen on and off. Anyone else have this issue?