Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Welcome to the Community @MelissaT4! Oh! yous Zip is pretty new to giving you these issues. But don't worry, let me suggest you to replace the battery and verify that there is proper contact between the battery and the battery contacts inside your Zip tracker. You can do this by opening the battery door of your Zip, removing your battery, and ensuring that the silver battery tab located in the lower right half of your tracker is flush with the white box outline in the tracker housing. The process can be followed here: http://imgur.com/a/l1KwH
Now for the syncing issue, let me suggest you to follow the tips on @AlejandraFitbit post to fix that.
Let me know how it goes! 
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Best Answer
Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Welcome to the Community @Cedrick! Let me help you out. 
What is the Fitbit that you are using? Can you please tell me the exact issue that you are having with your Fitbit?
Keep me posted!
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