The round back panel of my Apple Watch (SS 38cm) started detaching from the watch body. It just stuck to the magnetic charger when I picked up the watch this morning, and only a wire kept the watch and panel connected. Now it pops off when I lay it down on the desk, etc. Going to the Genius Bar to get it fixed. Will need to keep it away from water and sweat until then, since I'm pretty sure it has lost its water resistance property.