05-16-2016 00:35
05-16-2016 00:35
05-17-2016 11:54
05-17-2016 11:54
@Robbo59 Welcome to the Fitbit Community! That may be happening as a result of a false contact between the battery and the metal clip inside the tracker. The best thing to do is to bend that metal clip a little bid to make sure it has contact with the battery. Check this post to get more details and find links that will direct you to the steps.
Hope this helps. Let me know how it goes!