I have my Instinct since December and the Back button has always felt different, like "mushy", no click. I always wash it thoroughly when I know sweat has drenched it during an activity. Today I was thinking about it and an idea came to me: What if I use a drop of silicone spray? I did just that, one or two drops of silicone spray around the button and it is now very "clicky" just like the other buttons. Just wanted to share this in case anyone was as annoyed as I was because a button doesn't click on an otherwise perfect watch.