This is an old thread, but seems to be a recurring issue and it's one that I just had, so....
The bluetooth on my Ionic decided to stop working today (after only having the watch for about 3 months). My iPhone iOS upgraded last night, so I figured that must have been the issue. Still, nothing that I did seemed to help. I turned Bluetooth off and on, then repeated with turning the phone off and on in between...I thought I had reset my Ionic by pressing and holding the left and lower right buttons at the same time (more on this in a bit)...I uninstalled the Fitbit app from my phone and installed it again...I even removed the Ionic from my Fitbit app and tried to reinstall it. This is where I contacted customer service, because I could not reinstall the Ionic, since the bluetooth was not syncing to the phone. After a brief chat, it turned out that I had not actually reset my Ionic when I had tried to do so the first time. The instructions on the app's troubleshoot say to press the left and lower right buttons together. I took it a step further and held them down after pressing. The screen blinked and came back on, so I thought that it had been reset. However, customer support had me hold the buttons down for 10+ seconds until the screen went completely dark and the Fitbit logo appeared on the screen. After that, all was back to normal!
Basically, if you don't want to read all of my drama above, try to reset your Ionic by holding down the left and lower right buttons long enough for the Fitbit logo to appear on the screen. That might fix your troubles!
