Bests & Worsts Reviews from Amazon

I loved this until yesterday, when it completely stopped working! Battery is fully charged; and it won't sync on the app. Grrrr! (My one complaint, up until yesterday, was that it was impossible to see how fully charged it was unless I put it in the charger - on the app, it just says "battery medium" which really tells nothing. I had it say that, and then 20 minutes later got a message to say battery was dangerously low (or however they put it).