I'm having the same issue. When I sync it will get back on track, but I definitely lose some steps each time it happens. I have to add activity in manually. Extremely frustrating, and I can't get any answer from fitbit support.
I had purchased an extra zip a while ago when I realized they wouldn't be available anymore, and now I can't even set it up. I don't understand why they don't make/sell a device you can where somewhere other than the wrist.
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