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You can't reinstall the software but you can restart a fitbit, which can sort out all sorts of glitches. Here's how: https://help.fitbit.com/articles/en_US/Help_article/1186/
Only problem with it is that it doesn't always work so it's recommended to try it at least three times.
Best AnswerIm not sure if I understand @SteveH, there should be no problems with deleting the app then installing a fresh copy of Fitbit from the app store. It will require that the user log back into their account, but since there is no data ever sabes on the phone this is not a problem.
Not knowing what flaky things are happening, I say @Jak68 go for it, I have found that by doing this it had fixed problems in the past for me.
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Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
I thought the post was referring to the fitbit firmware rather than the app. Apologies if I got that wrong.