Yep, it would seem many have this problem. It started about 3 weeks ago for me and just got worse and worse. I could always get it working again, but it would never last.
As it was only getting worse I decided to try something different. I thought the problem might have something to do with the Screen Wake feature, so I went into the settings and changed it from Automatic to Manual. It's been about 30 hours since the change and I have not had one glitch/problem since. Everything seems to be working perfectly now, except for the fact that I have to either tap the screen or hit the button to get the screen to display. While I am losing a feature I liked, I can live with this.
You might want to give that a try, but if it doesn't work for you or you just need the Automatic wake feature to work, then call Fitbit's customer service number 1(877) 623-4997 and see what they can do for you.
