Fitbit app won't start up on my phone when I click on it.

[ReeReeZ]

The Fitbit app won't start up on my phone when I click on it. It worked for 2 years but has just stopped opening up.  I went to the app store and tried to open it from there, but it does the same thing - the screen turns white for a few seconds then back to my home screen without opening the app.  I thought about deleting the app and reinstalling it, but then I will probably lose all my tracking data that's stored in it, right?  Please help me!

[Rich_Laue]

Hello @ReeReeZ may I ask what device you sync through? 

Have you checked the Fitbit help 

[ReeReeZ]

Rich, I use my iphone.

I finally deleted the app from my phone and reinstalled it, and now everything works.  And the good news is that I didn't lose any of my past information.