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Welcome to the forums @lynnecrozier! Sometimes the side spring may be bent as a result of improper battery insertion or pressure being applied to the back housing. Please verify that there is proper contact between the battery and the battery contacts inside your Zip. 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. Let me know if it works! 
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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
@lynnecrozier Thanks the update! Reading that the problem rectified its self the next day was like a ray of sunshine. 
Happy stepping!
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