There seems to be a bit of an issue going on with fitbit both syncing and general oddness. My charge HR stopped syncing properly two days ago, I managed to get it to sync from time to time (after several attempts each time) and to all intents and purposes the fitbit itself seems to be working - unless I'm on a decent walk in which case now the HR monitor stops working or I try to add some off stepping activity. Its worth phoning fitbit (quicker than email) as they're very good if you have a faulty product. Having said that they're convinced my issue is with the ios app despite this also happening on my windows pc and people on android also having trouble.